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Ingredients

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• 1/2 cup (115 grams or 4 ounces) unsalted butter, at room temperature
• 2/3 cups (130 grams) granulated sugar
• 1/2 teaspoon kosher salt
• 2 large egg whites
• 1/2 teaspoon vanilla extract
• 1/2 cup (120 ml) buttermilk
• 1 teaspoon baking powder
• 2 tablespoons (16 grams) cornstarch
• 1 cup (130 grams) all-purpose flour
• 1/4 cup rainbow sprinkles
• 1/2 cup (115 grams or 4 ounces) unsalted butter, at room temperature
• 1 1/4 cups (150 grams) powdered sugar, sifted if lumpy
• Pinch of fine salt
• 1/2 teaspoon vanilla extract, plus more to taste
• 1 tablespoon milk or cream
• Rainbow sprinkles for decoration