Little Red Velvet Cakes

Cakes
Cooking spray
2 1/4 cups all-purpose flour
1 1/2 teaspoons baking powder
1/2 teaspoon salt
1 tablespoon unsweetened cocoa powder
1 (1 ounce) bottle red food coloring
1 cup buttermilk
1 tablespoon distilled white vinegar
1 teaspoon baking soda
1 teaspoon vanilla extract
1/2 cup plus 2 tablespoons unsalted butter, softened
1 2/3 cups granulated sugar
2 large eggs

Cream Cheese Frosting
8 ounces cream cheese, softened
1/2 cup unsalted butter, softened
2 teaspoons vanilla extract
1 (1 pound) box confectioners