Prepare cake batter with noted modifications (or not, whatever suits you), mix with an electric mixer or electric beaters. Stir in white chocolate chips.
Fill cupcake liners halfway with batter.
While cupcakes are baking, put icing in a bowl and beat powdered sugar into it. Set aside.
Grab four piping bags (if you're using standard size bags), and with a clean paint brush, paint the gel food coloring on the inside of the bags - we used pink, purple, and red. I used a sponge brush in our video above, but I actually think a regular paintbrush or small basting brush would work better. Allow the food coloring to set for 5 - 10 minutes.
When food coloring is set, add the white icing to the painted bags.
When cupcakes are done baking, remove from pan and allow to cool completely. Pipe icing on top, then add sprinkles and conversation hearts. You'll want to add the sprinkles right away as the added powdered sugar will make the outside of the icing dry quickly.