Not another dense, supersweet buttercream cupcake. These chocolate raspberry cupcakes layer a tender, cocoa-rich cake with a tart puree surprise inside, then top it with a cooked flour frosting that stays light and stable.
The frosting relies on a milk paste instead of powdered sugar, so the raspberry flavor comes through clean. The puree needs to be reduced until it’s thick enough to hold its own inside the cake without turning the crumb soggy. That’s the trick: get the reduction right, and the whole thing comes together without the usual buttercream heaviness or a runaway filling.
Whip up a cooked flour frosting for stable, less sweet topping
This frosting starts with a milk-flour paste cooked until it thickens. That paste gives you a light, whipped texture without the cloying sweetness of powdered sugar.
The cooked starch stabilizes the emulsion, so the frosting holds its shape on the cupcake. After whipping the butter and sugar until creamy, you add the cooled paste spoonful by spoonful, beating well after each.
Once the mixture looks light and airy, you fold in the raspberry puree. Because the base is already stable, the puree blends in without breaking the frosting, and the raspberry taste comes through clearly rather than being buried in sugar.
Reduce the raspberry puree until very thick for filling and frosting
The raspberry puree gets cooked down until it’s so thick that dragging a spoon across the pan leaves a clear trail. That thickness is key: when you spoon it into a hollowed cupcake, it won’t soak into the crumb and turn it soggy. The same puree also flavors the frosting, so the raspberry taste is consistent from the center to the top.
Straining out the seeds gives you a smooth puree that pipes easily and doesn’t leave gritty bits in the frosting. You end up with just over ¾ cup, enough to fill all twelve cupcakes and still have some for the frosting.
Alternate wet and dry ingredients to keep chocolate cupcakes tender
You add the flour mixture and buttermilk in three rounds, starting and ending with flour. That method limits gluten development, because you’re not stirring the flour into the liquid all at once.
Overmixing would make the cupcakes tough and dense; gentle folding keeps them light. Buttermilk adds acid, which tenderizes the gluten and reacts with the baking soda for a good rise.
You’ll feel the batter come together quickly, stop as soon as the streaks disappear. The result is a soft, springy crumb that holds the raspberry filling without falling apart.
Prep: 45 min · Cook: 20 min · Total: 55 min · Servings: 12 · Calories: 450 kcal
Key Ingredients for Chocolate Raspberry Cupcakes
Frozen raspberries: Frozen berries break down faster and give a more concentrated puree than fresh ones.
Dutch process cocoa powder: Its mild, smooth flavor pairs with the raspberry better than natural cocoa’s sharpness.
Buttermilk: The acid tenderizes the crumb and activates the baking soda for a good rise.
Whole milk for frosting: Whole milk gives the cooked flour paste the right thickness to stabilize the buttercream.
Caster sugar: Superfine sugar dissolves quickly in the frosting base, leaving no grittiness.
Build the raspberry puree first, it needs to cool while you prep the batter
Cook the puree
Combine frozen raspberries, lemon juice, and sugar in a saucepan over low-medium heat. Simmer 15 to 20 minutes, crushing berries and stirring, until dragging a spoon leaves a clear trail across the pan bottom.
Strain and cool
Pass through a fine-mesh sieve, pressing hard to extract all liquid. You should have just over ¾ cup.
If more, keep reducing. Let cool completely, warm puree will break the frosting later.
Whisk dry ingredients
Sift flour, cocoa, baking powder, baking soda, and salt into a bowl. Whisk to combine. This aerates the cocoa and breaks clumps, so the batter mixes evenly without overworking.
Cream butter and sugars
Beat melted butter with both sugars until well combined, about 1 minute. The mixture should look uniform and slightly grainy. No need to cream air, melted butter gives a tender crumb anyway.
Add eggs and vanilla
Add eggs one at a time, beating after each until fully incorporated. Scrape the bowl.
Add vanilla and beat. The batter should be smooth and glossy.
Alternate flour and buttermilk
Add flour mixture in three additions, buttermilk in two, starting and ending with flour. Stir gently after each until just combined. Stop when streaks disappear, overmixing toughens the crumb.
Fill and bake
Divide batter among 12 liners, filling two-thirds full. Bake at 350°F for 18 to 23 minutes, rotating halfway. A toothpick inserted in center comes out with a few moist crumbs, no wet batter.
Cool cupcakes
Let cupcakes cool in pan 5 minutes, then transfer to a wire rack. Cool completely before filling, warm cupcakes will melt the puree and frosting.
Make milk-flour paste
Whisk flour with a splash of milk to a smooth paste in a saucepan, then add remaining milk and half the sugar. Cook over low heat, whisking constantly, until it thickens to a pudding consistency.
Cool the paste
Transfer to a bowl, press plastic wrap directly onto surface, and cool to room temperature. Hot paste will melt the butter and break the frosting.
Whip butter and sugar
Beat softened butter with remaining sugar on medium-high until very creamy, about 5 minutes. Scrape bowl often. The mixture should be pale and fluffy.
Add paste spoonful by spoonful
With mixer on low-medium, add cooled milk paste a spoonful at a time, beating well after each. The mixture may look separated at first, keep beating until it comes together.
Whip until light
After all paste is added, beat on medium-high 5 to 7 minutes. The frosting should become light and creamy, like whipped cream. If it still looks split, keep beating, it will come together.
Add puree and vanilla
Add vanilla, ¼ cup raspberry puree (60ml), and salt. Beat on low just until combined. Stop immediately to avoid over-whipping.
Fill the cupcakes
Cut a 1-inch hole in center of each cupcake. Spoon 2 teaspoons of remaining raspberry puree into each cavity. The puree should sit in the hole without overflowing.
Frost and garnish
Pipe or spread frosting onto each cupcake. Top each with a fresh raspberry. The frosting should hold its shape without sliding off.
Chocolate Raspberry Cupcakes
Ingredients
Raspberry Puree
- 4 cups frozen raspberries 460g / ~1lb
- 1 tablespoon lemon juice
- 1 tablespoon white sugar
Chocolate Cupcakes
- 130 g plain flour (all-purpose flour) 1 cup / 4.6oz
- 40 g Dutch process cocoa powder ⅓ cup / 1.4oz
- ½ teaspoon baking powder
- ¼ teaspoon baking soda (bicarb soda)
- ¼ teaspoon fine sea salt
- 113 g unsalted butter, melted ½ cup / 1 stick / 4oz
- ½ cup caster sugar (superfine sugar) 100g / 3.5oz
- ½ cup packed dark brown sugar 100g / 3.5oz
- 2 large eggs, room temperature
- 2 teaspoons vanilla extract
- ¾ cup buttermilk 180ml
Raspberry Frosting
- 1 cup whole milk 250ml
- ¼ cup plain flour (all-purpose flour) 33g
- 1 cup caster sugar (superfine sugar) 200g / 7oz, divided 50:50
- 226 g unsalted butter, softened 2 sticks / 1 cup
- 3 teaspoons vanilla extract
- Pinch fine sea salt
Assembly
- Raspberries for topping
Instructions
Raspberry Puree
Cook Raspberry Puree:
RASPBERRY PUREE: In a medium heavy-bottomed saucepan set over low-medium heat, combine the frozen raspberries, lemon juice, and 1 tablespoon of sugar. Bring the mixture to a simmer, then continue cooking for 15-20 minutes, stirring occasionally and crushing the berries, until it reduces to a very thick puree. While the raspberries cook, you can begin preparing the cupcake batter.Strain and Cool Puree:
When the puree is so thick that the bottom of the pan remains visible for a few seconds after dragging a spoon through it, pass it through a fine-mesh sieve, pressing firmly to extract as much liquid as possible. You should end up with just over ¾ cup of puree; if you have significantly more, continue reducing it further. Allow the puree to cool to room temperature before using (see note 3).
Chocolate Cupcakes
Preheat Oven and Prep:
CHOCOLATE CUPCAKES: Preheat the oven to 350°F (180°C / 160°C fan) and line muffin tins with paper liners.Sift Dry Ingredients:
In a bowl, sift together the flour, cocoa powder, baking powder, baking soda, and salt. Whisk to combine thoroughly.Cream Butter and Sugars:
In a separate bowl, using a balloon whisk or a stand mixer fitted with the paddle attachment, beat the melted butter with both sugars until well combined.Add Eggs and Vanilla:
Add the eggs one at a time, scraping down the sides of the bowl after each addition, and beat until fully incorporated. Add the vanilla and beat to combine.Add Flour Mixture:
Add one-third of the flour mixture to the wet ingredients and stir gently until just combined.Alternate Buttermilk and Flour:
Add half of the buttermilk and mix gently again. Continue alternating additions, ending with flour, until all flour and buttermilk are just combined. Avoid overmixing or using heavy-handed techniques, as this will result in dense, tough cupcakes.Fill and Bake Cupcakes:
Fill the cupcake liners to about two-thirds full. Bake for 18-23 minutes (see note 5), rotating the pan halfway through for even baking. The cupcakes are done when a toothpick inserted into the center emerges with just a few crumbs attached.Cool Cupcakes:
Let the cupcakes cool in the pan for 5 minutes, then transfer them to a wire rack to cool completely before frosting.
Raspberry Frosting
Cook Flour Paste:
RASPBERRY FROSTING: In a small saucepan, whisk together the ¼ cup of flour with a small amount of the milk to form a smooth paste. Add the remaining milk and ½ cup of the sugar. Cook over low heat, whisking constantly, until the mixture thickens to a pudding-like consistency.Cool Paste:
Transfer the thickened mixture to a bowl and press plastic wrap directly onto the surface. Allow it to cool to room temperature (see note 3).Beat Butter and Sugar:
Once everything is cool, in a stand mixer fitted with the paddle attachment, beat the butter with the remaining ½ cup of sugar on medium-high speed until very creamy, about 5 minutes. Scrape down the sides of the bowl several times during the process.Add Paste to Butter:
Add the cooled milk mixture one spoonful at a time, beating on low-medium speed until each addition is fully incorporated before adding the next.Whip Frosting:
After all the paste has been added, continue mixing on medium-high speed for another 5-7 minutes. If the mixture appears separated, continue beating; it will come together into a light, whipped-cream-like frosting.Add Puree and Vanilla:
Once the frosting looks whipped and light (and not split), add the vanilla, ¼ cup (60ml) of the raspberry puree, and a pinch of salt. Beat on low speed just until combined, then stop.
Assembly
Fill Cupcakes with Puree:
ASSEMBLY: Cut a 1-inch hole in the top of each cupcake and spoon 2 teaspoons of the remaining raspberry puree into the cavity.Frost and Garnish:
Pipe or spread the frosting onto each cupcake, then top with a fresh raspberry.- Please take a moment to leave a comment & rating. It’s appreciated and so helpful.
Three swaps that work in these chocolate raspberry cupcakes
5 teaspoons lemon juice or white vinegar. Let sit 5 minutes before using. The acid in the soured milk still activates the baking soda and tenderizes the crumb.
Cupcakes rise the same and taste nearly identical. Don’t skip the acid, plain milk will yield a denser, less tender cake.
Dutch process cocoa powder: Natural cocoa powder, same weight (40 g). Natural cocoa is more acidic and less mellow. The cupcakes will have a sharper chocolate flavor and a slightly darker color.
Because you’re also using baking soda, the rise won’t change much, but the taste skews more bitter. Fine if you prefer that edge.
Frozen raspberries: Fresh raspberries, same weight (460 g). Fresh berries contain more water, so the puree will take longer to reduce.
Simmer an extra 5 to 10 minutes to hit the same thick consistency. The puree’s flavor will be a bit brighter and less concentrated than with frozen.
Use frozen if you want the deeper, jammy raspberry taste the recipe aims for.
Tips
- Use a piping tip to cut a clean cone from the cupcake center: press a round tip (like Ateco 808) straight down about halfway, twist, and pull out. This leaves a precise cavity with a neat top piece you can replace after filling.
- If the raspberry puree is too runny, it will soak into the cupcake crumb and make the filling vanish. Cook it until a spatula dragged across the pan bottom leaves a clear trail that stays visible for 2 to 3 seconds before the puree slowly flows back.
Storage and Serving
These cupcakes are best within 24 hours of assembly. The raspberry puree filling keeps the crumb moist, but over time the cake absorbs it and loses contrast.
If you’re serving the same day, leave the raspberry topping off until just before serving to keep it fresh. For leftovers, store frosted cupcakes in an airtight container in the fridge for up to 3 days. The frosting holds its texture well when chilled, but the cake will firm up.
Let the cupcakes sit at room temperature for 30 minutes before serving to soften the crumb and let the raspberry flavor come through. The unfrosted cupcakes keep at room temperature for 2 days, but once filled, the puree gradually soaks in, so fill and frost as close to serving as possible.
You can freeze unfrosted cupcakes for up to 3 months. Wrap each tightly in plastic wrap and place in a freezer bag. Thaw at room temperature, then fill and frost.
Do not freeze assembled cupcakes; the frosting’s texture will break upon thawing.
I still whisk that milk-flour paste like a maniac until it’s thick enough to hold a line, because I once ended up with soup instead of frosting.
Frequently Asked Questions
Can I make these cupcakes a day ahead?
You can bake the unfrosted cupcakes up to two days ahead and store them at room temperature, but wait to fill and frost them until the day you serve. The raspberry puree filling will gradually soak into the crumb, so the contrast between cake and filling fades overnight. If you need to get ahead, bake and freeze the unfrosted cupcakes for up to three months, then thaw, fill, and frost near serving time.
Why did my frosting turn out runny?
The most likely cause is the milk-flour paste or the puree wasn’t fully cooled before mixing. Warm paste melts the butter, making the frosting soupy. Let both cool to room temperature, then re-chill the frosting for 10 minutes and re-whip; if it stays loose, the butter may have been too soft, chill the bowl briefly and whip again.
Another check: the puree must be reduced to the specified thickness so it doesn’t add excess moisture.
Can I use fresh raspberries instead of frozen for the puree?
Yes, but fresh berries contain more water, so you’ll need to simmer the puree an extra 5 to 10 minutes to reach the same very thick consistency where a spoon leaves a clear trail. The flavor will be a bit brighter and less jammy than with frozen berries. If you want the deeper raspberry taste the recipe aims for, stick with frozen.
How is this frosting different from American buttercream?
This frosting uses a cooked milk-flour paste as its base instead of powdered sugar, so it’s much less sweet and has a light, whipped-cream-like texture. The cooked starch stabilizes the emulsion, letting you add liquid raspberry puree without the frosting breaking. American buttercream relies on powdered sugar for structure and tends to be sweeter and denser, and adding puree often makes it grainy or runny.
