Make cupcakes. Prepare white and red velvet batter following recipe directions.
Place two-tone insert in baking cup-lined muffin pan. Use a cut disposable decorating bag to fill center ring of insert 2/3 full with white batter. Use a cut disposable decorating bag to fill outer ring of insert 2/3 full with red velvet batter. Remove insert and repeat until all cavities are filled. Remove insert. Bake and cool cupcakes.