Sprinkles in a layer cake? Been there. 💁♀️
Sprinkles in a cupcake? Done that. 💅
Sprinkles in a sheet cake? 🤯
This sprinkle surprise sheet cake is SO. MUCH. FUN. My cake-loving child went crazy for it. My other child said, “Oh…cool.” A resounding success! Create your little sprinkle pockets in an orderly fashion like I did (so you can find them later) or go for a random approach and get the party started!
Sprinkle Surprise Sheet Cake
- 9″ x 13″ Sheet cake pan
- 1 Vanilla Sheet Cake recipe, baked and cooled
- 2 batches of American Buttercream
- 1 cup of sprinkles
- Large round piping tip (Ateco #806)
- Small spoon
- Gel food coloring in pink, orange, yellow, green, blue, and purple
- Piping bags
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Add the Sprinkles
Place the sheet cake on a cake board or serving platter. Use the fat end of a large round piping tip to remove little sections of cake. Create the holes in whatever pattern looks fun to you. Use a chop stick or skewer to remove the rounds of cake from the piping tip. Don’t eat them up just yet! Set the cakes aside to plug the sprinkle holes later.
Fill each of the holes with about a 1/2 tablespoon of sprinkles. Plug each of the holes with a round of cake. Tear away some of the cake from the bottom of the round if there’s not enough room for it to fit back into place. That little bit you’re allowed to snack on.
Pipe the Rainbow
Divide one of the batches of buttercream into 6 small bowls. Tint the buttercream in each of the bowls a different color of the rainbow. I took some liberties and went with pink instead of red, so feel free to paint your rainbow however you like! Fill piping bags with each of the colors and snip the tips of the bags to create a quarter-sized openings in each.
To mimic the pattern I created, first pick up the purple bag and pipe a strip of diagonally across the cake from corner to corner. Switch to the bag of blue buttercream and pipe a strip on either side of the purple line. Repeat in ROYGBIV order on either side of the purple line until the cake is covered. Use a large offset spatula to smooth the lines together, swiping only in the direction of the strips.
Pipe the Clouds
Fill a piping bag with the remaining white buttercream. Snip the tip to reveal a quarter-sized opening. Pipe happy little clouds all around the sides of the cake, allowing the clouds to peak up over the rainbow buttercream in spots.
Start the Party
Slice up the sprinklefied (technical term) sheet cake and enjoy! If you’re baking first and partying later, the sheet cake can be made up to a day in advance and kept under plastic wrap at room temperature. I recommend against storing a sprinklefied cake in the fridge since the fridge’s humidity could cause the sprinkles to get sticky or soften.