You’ll also need piping bags and a large round piping tip or alternatively, spread the frosting with a knife.
Instructions
Place the trays on a flat baking sheet or work surface and lightly spray each one with baking spray. You’ll need about 8 trays. Preheat the oven according to the cake mix instructions.
Prepare the cake batter as directed on the box. Once mixed, stir holiday sprinkles into the white portion of the batter until evenly distributed.
Using a small cookie scoop, add batter to each tray, alternating scoops of red and white batter. Fill each tray about halfway to two-thirds full to allow room for rising.
Bake according to the package directions, starting with the cupcake bake time and adding a few extra minutes as needed. Check often and remove once the centers are set. Let the cakes cool completely. If you want perfectly flat tops, trim them once cooled and save the scraps for cake pops or snacking.
To make the frosting, beat the butter until smooth and fluffy. Add powdered sugar, heavy cream, and vanilla, then mix until light and spreadable.
Transfer the frosting to a piping bag fitted with a large round tip. Pipe generous dollops of frosting on each tray cake. Finish with a sprinkle of glittery sugar and tuck an edible image into the frosting for a festive finish.
If you prefer a simpler look, you can spread the frosting on with a knife, sprinkle with glittery sugar, and place the edible image flat on top instead.