Red Velvet Heart Whoppie Pies

For the cookies:
2 cups of all purpose flour
2 tablespoons of cocoa powder
1/2 teaspoon of baking powder
1/4 teaspoon of salt
8 tablespoons of unsalted butter, at room temperature
1 cup of light brown sugar, packed
1 large egg
1 teaspoon of vanilla extract
1/2 cup of buttermilk, at room temperature
1 ounce of red food coloring

Ingredients:
For the frosting:
8 ounce of cream cheese
5 tablespoons of unsalted butter, at room temperature
2 teaspoons of vanilla extract
2 1/2 cups confectioners' sugar, sifted
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