Lemon Cupcakes with Blackberry Cream Cheese Frosting

INGREDIENTS

2 1/4 cups

cake flour

1 tbsp

baking powder

1/2 tsp

salt

1 1/4 cups

buttermilk

large egg whites

1 1/2 cups

sugar

1 stick

unsalted butter, at room temperature

1 tsp

pure vanilla extract

1/2 tsp

pure lemon extract

lemon zest from two lemons

8 oz

cream cheese

1/4 cup

butter (1/2 stick)]

1 pint

blackberries, pureed and strained (approximately 1/4 cup)

1/8 tsp

lemon zest

3 cups

powdered sugar

Ina Garten's Lemon Curd