Cake serves 12.
Bake your favorite 1-layer cake recipe or mix in round pan. Cool cake in pan on wire rack 10 minutes. Remove from pan and cool completely. Place on foil-wrapped cake circle.
Using spatula, ice cake smooth in rose buttercream.
Position heart stencil on cake top. Sprinkle red sugar over stencil openings. Carefully remove stencil. Decorate bottom border with tip 12 pull-out shells, bringing tapered ends of each pair of shells together to form a heart.