Ingredients
- 1.5 c. all-purpose flour
- 0.25 c. powdered sugar
- 2 tsp. baking powder
- 0.5 tsp. kosher salt
- 1.25 c. whole milk
- 1 large egg yolk, plus 3 egg whites
- 0.25 c. rainbow sprinkles, plus more for serving
- 4 tbsp. unsalted butter, melted and cooled
- 1 c. vanilla frosting
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