Mise en place. Line a 9" x 13" jelly roll pan with baking parchment paper. Preheat oven according to directions on cake box.
Mix red velvet cake mix, milk, melted butter, and eggs according to directions on box.
Pour into a greased 9" x 13" baking pan.
Bake according to directions on box.
Allow cake to cool.
Discard edges of cake. Crumble up 1 to 2 cups of cake. Discard the rest.
Melt milk chocolate chips for 30 sec. at 50% power. Stir. Repeat, stirring between every cycle. Don't overheat! Chocolate is easy to scorch. Once melted, spread over bottom of prepared pan.
Melt white chocolate for 30 sec. at 50% power. Stir. Repeat, stirring between every cycle. Don't overheat! Chocolate is easy to scorch. Once melted, spread over top of milk chocolate. Use a knife to swirl patterns through it.
Sprinkle desired amount of crumbled red velvet cake over the top of the chocolate, pressing down.
Place in fridge for 30 minutes. Break up using hands or sharp knife.