Recipe with video instructions: Nobody would guess what's hiding in this deliciously fun frosted pound cake! Ingredients: Blue Cake:, 1 cup all-purpose flour, 1 3/4 teaspoon baking powder, 1/4 teaspoon salt, 1/4 cup unsalted butter, room temperature, 1/2 cup granulated sugar, 1 teaspoon vanilla extract, 1 large egg, 1/2 cup milk, Blue food colouring, White Cake:, 2 cups all-purpose flour, 3 1/2 teaspoon baking powder, 1/2 teaspoon salt, 1/2 cup unsalted butter, room temperature, 1 cup ...