These baked banana donuts with brown sugar glaze hit the same caramelized notes as a banana split, but in a tender, cakey ring that won’t slide apart. The trick is balancing moisture: mashed banana and sour cream keep the crumb soft without going greasy, while the glaze leans on dark brown sugar’s molasses for a coating that tastes cooked, not just sweet. Caramelizing the banana topping instead of using raw slices means it stays put and adds a jammy contrast.
If you’ve ever had a baked donut turn out dry or dense, this batter sidesteps that with a few smart choices, none of which require a deep fryer.
Why do mashed banana and sour cream make baked donuts so tender?
Banana brings moisture and a concentrated sweetness that lets you cut back on fat without drying out the crumb. As it bakes, the fruit’s natural pectin and fibers help trap steam, keeping the interior soft.
Sour cream does two things: its acidity balances the ripe banana’s sugars, and its fat coats flour proteins, limiting gluten formation. Less gluten means a more tender bite, closer to a cake than a bread. Together they create a crumb that feels rich and almost creamy, even though there’s no deep-frying.
You’ll taste the banana clearly, but the sour cream prevents it from becoming cloying.
How does the brown sugar glaze get that rich, caramel-like coating?
Dark brown sugar contains molasses, which gives the glaze depth and a slight tang. When you heat it with butter, the sugar dissolves into a smooth syrup; that initial cook breaks down large crystals, so the final glaze stays silky instead of turning gritty. Powdered sugar then thickens the mixture without introducing new crystals, the cornstarch in it helps stabilize the emulsion.
The result is a coating that clings to the donut with a glossy sheen and a flavor that tastes cooked, not just sweet. It firms up as it cools but stays tender enough to yield when you bite.
Why caramelize bananas instead of using raw slices?
Raw banana slices on a glazed donut slide off and turn brown within minutes. Caramelizing them in butter and brown sugar does two things: it softens the fruit into a jammy, pliable texture that stays put, and the brief heat concentrates the sugars so each bite hits with a deeper, almost toasty sweetness.
The butter-sugar coating also sears the cut sides, creating a thin, crisp edge that contrasts with the soft donut. You get a topping that holds its shape, resists oxidation, and adds a textural pop raw banana can’t deliver. The cinnamon you add ties it back to the donut’s spice without overwhelming.
What’s the real difference between baked and fried donuts?
Fried donuts develop a crisp, oily crust from the hot oil setting the exterior instantly while the inside steams. Baked donuts skip that crust entirely, the heat surrounds them evenly, so the surface stays tender and the interior cooks through as a uniform cake. That means less fat overall, but the trade-off is a softer, more delicate bite.
Buttermilk and banana compensate by adding moisture that mimics some of the richness you lose. The result isn’t a fried-donut substitute; it’s a different thing entirely, lighter, more like a muffin in texture, but with the distinct ring shape and the same ability to hold a glaze.
Prep: 40 min · Cook: 10 min · Total: 50 min · Servings: 8 · Calories: 440 kcal
What to know about the ingredients before you start
Bananas: Use ripe bananas with brown speckles; they mash easily and bring the most sweetness and moisture.
Buttermilk: Room temperature buttermilk blends evenly and keeps the batter from seizing when mixed with melted butter.
Sour cream: Full fat sour cream gives the richest texture; low fat will make the donuts drier.
Dark brown sugar: Dark brown sugar has more molasses than light, which deepens the flavor in both the donuts and glaze.
Powdered sugar: Sift powdered sugar if it’s lumpy; otherwise the glaze may have small clumps.
I tried dipping immediately after making the glaze and it was too thin; waited 15 minutes instead of 10 and got a clumpy mess.
How to make banana donuts with brown sugar glaze: step by step
Prep the pan and oven
Grease a nonstick donut pan with butter or spray. If you skip this, the donuts will stick. Set the oven to 350°F.
Mix dry ingredients
Whisk flour, cinnamon, baking powder, baking soda, and salt together. Lift the whisk to see no lumps remain.
Mix wet ingredients
In another bowl, whisk buttermilk, melted butter, mashed banana, both sugars, sour cream, oil, and vanilla. The banana should be speckled, not soupy.
Combine wet and dry
Fold the wet mixture into the dry with a spatula. Stop as soon as no flour streaks show; overmixing makes the donuts tough.
Fill the pan
Transfer the batter to a piping bag and pipe into the pan, filling each cavity about two-thirds full. The batter should mound slightly.
Bake the donuts
Bake on the center rack for 11 to 12 minutes. The tops should spring back when pressed and a toothpick inserted comes out clean.
Cool and unmold
Cool the pan on a wire rack for 5 minutes, then invert and tap gently. If they stick, let them cool another minute before inverting.
Make the glaze
In a saucepan, melt butter and brown sugar over medium heat, stirring until smooth. Add milk, bring to a simmer, then remove from heat. Whisk in powdered sugar and vanilla until glossy.
Let it rest 10 to 12 minutes; it will be thin at first but thickens as it cools. If it’s still runny after resting, let it sit longer. If too thick, microwave in 10-second bursts.
Caramelize the bananas
Melt butter in a skillet over medium heat. Sprinkle brown sugar and cinnamon over it, then add banana slices. Cook 2 minutes without moving them, then flip gently and cook 1 more minute.
The bananas should be softened with a golden edge.
Glaze and top
Dip each donut top into the glaze and let excess drip off. Place a caramelized banana slice in the center. The glaze should cling without running off; if it drips too fast, let it cool longer.
Banana Donuts with Brown Sugar Glaze
Ingredients
Donuts
- 1 ⅔ cup all-purpose flour 200 g
- 3/4 tsp ground cinnamon
- ¾ tsp baking powder
- ¼ tsp baking soda
- ¼ tsp fine sea salt
- ¾ cup buttermilk room temperature
- 4 tbsp unsalted butter melted (57 g)
- ½ cup mashed ripe banana about 1 medium
- ¼ cup granulated sugar 50 g
- ¼ cup dark brown sugar packed (50 g)
- 2 tbsp sour cream room temperature
- 2 tbsp canola oil
- 2 tsp vanilla extract
Glaze
- 1/2 cup dark brown sugar packed (100 g)
- 4 tbsp unsalted butter 57 g
- 2 ½ tbsp milk
- 1 cup powdered sugar 120 g
- 2 tsp vanilla extract
Caramelized Bananas
- ½ tbsp unsalted butter 7 g
- 2 tbsp dark brown sugar packed (25 g)
- ¼ tsp ground cinnamon
- 1-2 medium fresh bananas sliced into ½-inch pieces
Instructions
Donuts
Prepare Pan and Oven:
Grease a nonstick donut pan lightly with butter or spray; set aside. Heat oven to 350°F (175°C).Mix Dry Ingredients:
In a bowl, combine flour, cinnamon, baking powder, baking soda, and salt with a whisk.Whisk Wet Ingredients:
In another bowl, whisk buttermilk, melted butter, mashed banana, granulated sugar, ¼ cup brown sugar, sour cream, oil, and 2 tsp vanilla.Combine Wet and Dry:
Fold wet mixture into dry mixture until no streaks remain.Fill Donut Pan:
Transfer batter to a piping bag and fill the donut pan.Bake Donuts:
Place pan on the center rack and bake for 11-12 minutes, until tops bounce back when pressed.Cool and Remove Donuts:
Cool the pan on a wire rack, then invert and carefully remove donuts.
Glaze
Make Brown Sugar Glaze:
For the glaze: In a saucepan, heat 4 tbsp butter and ½ cup brown sugar until smooth. Stir in milk and bring to a simmer. Take off heat, whisk in powdered sugar and 2 tsp vanilla until smooth. Pour into a bowl and let rest for 10-12 minutes. Glaze will be thin but thickens as it cools.
Caramelized Bananas
Caramelize Bananas:
For caramelized bananas: In a saucepan over medium heat, melt ½ tbsp butter. Sprinkle 2 tbsp brown sugar and ¼ tsp cinnamon over the butter, then add banana slices. After 2 minutes, flip gently and cook for 1 more minute.Glaze Donuts:
Dip donut tops into the glaze. If glaze drips off quickly, let it cool longer. If too thick, warm in a microwave in 10-15 second bursts until desired consistency.Top with Bananas:
Place caramelized banana slices in the center of each donut and serve.
Storage and Serving
These donuts taste best within 2 hours of glazing and topping, while the glaze is glossy and the caramelized bananas are tender with a slight edge. After that, the bananas soften further and the glaze begins to absorb into the crumb. For leftovers, store unglazed donuts in an airtight container at room temperature for up to 2 days.
The glaze and caramelized bananas should be stored separately in the fridge and added just before serving. To reheat a stored donut, microwave for 10 seconds, then glaze and top fresh.
Do not refrigerate assembled donuts; the bananas turn mushy and the glaze gets sticky. The unglazed donuts freeze well for up to 1 month.
Thaw at room temperature, then warm slightly before glazing. The glaze can be made 1 day ahead and stored covered at room temperature; reheat gently in the microwave before using. The caramelized bananas do not keep: make them fresh when you plan to serve.
Tips
- Test your baking powder and soda by dropping a pinch into hot water (baking powder) or vinegar (baking soda); if it fizzes vigorously, they are fresh. Stale leaveners will leave your donuts flat and dense.
Three swaps that work in this banana donut batter, and one that doesn’t
Buttermilk: Whole milk plus 1 tablespoon lemon juice or white vinegar per ¾ cup. Let stand 5 minutes until it thickens slightly.
The acidity is the key here, it reacts with baking soda to lift the donuts and tenderizes the crumb. Milk plus acid does exactly that, so the texture stays soft and the rise is the same. No sour tang?
Use regular buttermilk powder reconstituted per package directions.
All-purpose flour: Replace up to half the all-purpose flour with whole wheat pastry flour. Use ⅚ cup all-purpose plus ⅚ cup whole wheat pastry flour (about 100 g each). Whole wheat pastry flour is finer and lower in protein than standard whole wheat, so it won’t make the donuts dense or dry.
You’ll get a slightly nuttier flavor and a crumb that’s still tender, not tough. Go beyond half and the donuts turn heavy; the banana and sour cream can’t compensate for that much fiber.
Butter (in donuts or glaze): For dairy-free: use a plant-based butter stick (80% fat) or refined coconut oil. Melt and use the same amount by weight. Coconut oil makes the crumb a bit firmer when cool but still moist.
Plant butter mimics butter’s behavior in the glaze, it sets up glossy and smooth. Both change the flavor slightly; the donuts will taste less rich and the glaze loses that buttered-caramel note.
The texture holds up well enough that the swap is worth it if you need it.
Frequently Asked Questions
Can I make the donut batter ahead of time and bake later?
No, you should bake the batter right away. The leavening starts reacting as soon as you mix the wet and dry ingredients, and the batter will lose lift if it sits.
If you need a head start, bake the donuts, cool them, and store unglazed in an airtight container at room temperature for up to 2 days. Glaze and top fresh when you serve.
Why did my glaze turn out too thick/thin and how do I fix it?
If the glaze is too thin, it hasn’t rested long enough, let it sit the full 10 to 12 minutes; it thickens as it cools. If it’s still too thin after resting, let it sit longer. If too thick, microwave in 10-second bursts until it loosens.
The glaze should cling to the donut and drip slowly; if it runs off immediately, it’s too thin.
Can I use overripe bananas for this recipe?
Yes, overripe bananas (brown to almost black skin) are ideal, they mash easily and bring concentrated sweetness and moisture. Avoid bananas that are still green or just yellow; they won’t mash smoothly and will lack the sugar and banana flavor this recipe relies on.
How do I prevent the donuts from sticking to the pan?
Grease the pan generously with butter or nonstick spray before filling. After baking, cool the pan on a wire rack for 5 minutes, then invert and tap gently.
If they still stick, let them cool another minute before trying again. The donuts release best when slightly warm, not hot or fully cool.
Are these donuts supposed to be cakey or more like yeast donuts?
They’re cakey, like a tender muffin in a ring shape. The batter uses baking powder and baking soda, not yeast, so they’re dense and moist rather than airy and chewy. The buttermilk, sour cream, and banana keep the crumb soft, but the texture is distinctively a baked cake donut.
