Pink Velvet Cupcakes

INGREDIENTS

6 tbsp

unsalted butter, at room temperature

3/4 cup

granulated white sugar

6 tbsp

sour cream, at room temperature

2 tsp

vanilla extract

large Eggland's Best egg whites, at room temperature (divided)

1 1/4 cups

all-purpose flour

1 1/4 tsp

baking soda

1/4 tsp

salt

1/2 cup

buttermilk, at room temperature

1 tsp

white vinegar

drops pink food coloring

-ounces cream cheese, at room temperature

1/4 cup

salted butter, at room temperature

4 1/4 cups

powdered sugar, divided

1 tsp

vanilla extract

2 tsp

water or milk

pearl sprinkles (if desired)