- 1 and 3/4 cups (200g) cake flour (spoon & leveled)*
- 3/4 teaspoon baking powder
- 1/4 teaspoon baking soda
- 1/4 teaspoon salt
- 1/2 cup (115g) unsalted butter, softened to room temperature
- 1 cup (200g) granulated sugar
- 3 large egg whites, at room temperature*
- 2 teaspoons pure vanilla extract
- 1/2 cup (120g) full-fat sour cream at room temperature*
- 1/2 cup (120ml) whole milk at room temperature*
- 1/2 cup (80g) rainbow sprinkles* (plus extra for garnish)
- vanilla buttercream or your choice of frosting
- Preheat the oven to 350°F (177°C). Line a 12-cup muffin pan with cupcake liners. Line a second pan with 2 liners – this recipe makes about 14 cupcakes. Set aside.
- Whisk the cake flour, baking powder, baking soda, and salt together. Set aside.
- Using a handheld or stand mixer fitted with a paddle attachment, beat the butter and sugar together on high speed until smooth and creamy, about 2 minutes. Scrape down the sides and up the bottom of the bowl with a rubber spatula as needed. Add the egg whites and vanilla extract. Beat on medium-high speed until combined, then beat in the sour cream. Scrape down the sides and up the bottom of the bowl as needed. With the mixer on low speed, add the dry ingredients until just incorporated. With the mixer still running on low, slowly pour in the milk until combined. Do not over-mix. Gently and slowly whisk in the sprinkles. The batter will be slightly thick.
- Pour/spoon the batter into the liners. Fill only 2/3 full to avoid spilling over the sides. Bake for 19-22 minutes, or until a toothpick inserted in the center comes out clean. For around 30 mini cupcakes, bake for about 11-13 minutes, same oven temperature. Allow the cupcakes to cool completely before frosting.
- Frost cooled cupcakes with vanilla buttercream. I tinted it with 1 drop Dusty Rose Gel Food Coloring and used Ateco 849 piping tip. You can watch me decorate the cupcakes in the video above.
- Leftover cupcakes keep well covered tightly in the refrigerator for 3 days.
- Make Ahead & Freezing Instructions: Cupcakes can be made ahead 1 day in advance, covered, and stored at room temperature. Frosting can also be made 1 day in advance, covered, and stored in the refrigerator until ready to use. Freeze frosted or unfrosted cupcakes for up to 2-3 months. Thaw overnight in the refrigerator.
- Cake Flour: If you can’t get your hands on cake flour, you can make a cake flour substitute. I suggest doing this twice, mixing it all up in 1 bowl then removing 1/4 cup since you need 1 and 3/4 cups in this recipe.
- Egg Whites: Using all egg whites is KEY to their soft and fluffy texture. Here is the egg separator I use and love! Here are some recipe ideas for leftover egg yolks.
- Whole Milk & Sour Cream: Whole milk and sour cream are strongly recommended for the best taste and texture. A full fat plain yogurt would work instead, though the cupcakes may not be as light. Same goes with a lower fat milk.
- Sprinkles: Do not use nonpareils (the little balls) as they quickly bleed their color.
- Why is everything at room temperature? All refrigerated items should be at room temperature so the batter mixes together easily and evenly. Read here for more information.
- Confetti Cake: I suggest following my white cake recipe as the base, which is almost double this cupcake recipe. I also have a taller vanilla cake recipe as well. Fold 3/4 cup (120g) of rainbow sprinkles into either batter.
- Special Tools: KitchenAid Stand Mixer, Egg Separator, Cupcake Pan, Cupcake Liners, Pink Gel Food Coloring, Piping Tip, Piping Bags
This article and recipe adapted from this site