Pink Velvet Cupcakes

Bahan-bahan (12 porsi)

• 6 tablespoons unsalted butter, (at room temperature)
• ¾ cup granulated white sugar
• 6 tablespoons sour cream, (at room temperature)
• 2 teaspoons vanilla extract
• 3 large egg whites, (at room temperature (divided))
• 1¼ cups all purpose flour
• 1¼ teaspoons baking soda
• ¼ teaspoon salt
• ½ cup buttermilk, (at room temperature)
• 1 teaspoon white vinegar
• 9 drops pink food coloring
• 8 ounces cream cheese, (at room temperature)
• ¼ cup (½ stick) salted butter, (at room temperature)
• 4¼ cups powdered sugar, (divided)
• 1 teaspoon vanilla extract
• 2 teaspoons milk
• pearl sprinkles ((if desired))