Blue velvet cupcakes Ingredients For the Cupcakes 2 cups sugar ½ pound (2 sticks) butter, at room temperature 2 eggs 1 tablespoon cocoa powder 1 Tbsp Wilton royal blue gel food coloring 1 small dab of violet gel food coloring 2 ½ cups cake flour 1 teaspoon salt 1 cup buttermilk 1 teaspoon vanilla