Strawberry Lemonade Cupcakes

INGREDIENTS

1 1/4 cups

all-purpose flour

3 tbsp

cornstarch

2 tsp

baking powder

1/4 tsp

salt

1/2 cup

unsalted butter, softened to room temperature

1 cup

granulated sugar

2 tbsp

lemon zest, freshly grated

large egg whites, you can discard the yolks

1 1/2 tsp

vanilla

1/2 cup

sour cream, room temperature

3 tbsp

lemon juice, freshly squeezed*

8 oz

fresh strawberries

3/4 cup

unsalted butter, softened to room temperature

3 cups

powdered sugar, sifted

1 tbsp

whipping cream, if needed