Preheat Oven and Line Pans:
Set the oven to 325°F (165°C). Place 19 grease-proof liners into cupcake pans.Sift and Whisk Dry Ingredients:
Combine the flour, Clearjel or pudding mix, baking powder, baking soda, salt, and sugar in a bowl. Sift these dry items, then whisk thoroughly to blend.Whisk Wet Ingredients Together:
In another bowl, whisk together buttermilk, water, vanilla extract, almond extract if using, vegetable oil, corn syrup, egg, and egg whites until fully combined and smooth.Combine Wet and Dry Mixtures:
Add the wet mixture to the dry blend, then immediately pour in the apple cider vinegar and stir until evenly mixed.Add Melted Butter and Whisk:
Add the melted salted butter to the batter and whisk briefly until the batter is smooth, glossy, and well combined.Portion Batter into Liners:
Using a 2-ounce scoop or 1/4 cup measure, portion batter into the lined cups. Allow the filled liners to rest for 5-10 minutes prior to baking to improve the rise.Bake and Lower Temperature:
Position the pans on the middle or top oven rack (not the bottom). Bake at 325°F (165°C) for 10 minutes, then lower the temperature to 300°F (150°C). Continue baking for another 7-10 minutes, until a toothpick or paring knife inserted comes out mostly clean (a few moist crumbs are acceptable, but not wet batter). Monitor closely near the end.Brush Cupcakes with Simple Syrup:
Prepare a simple syrup by mixing 2 teaspoons sugar and 2 teaspoons water in a microwave-safe bowl. Microwave for 20-30 seconds until the sugar dissolves when stirred. Brush this syrup over the warm cupcakes, then allow them to cool completely. Unfrosted cupcakes can be kept at room temperature or frozen in their tins if well wrapped.