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In a medium bowl or container, create a mixture of your favourite sprinkles: non-pareils, rainbow jimmies, chocolate sprinkles, pearls, etc. Set aside.
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On an 8-inch round cake board (or cake plate), put a small dollop of frosting. Cut your 3 cake layers each once horizontally with a long, serrated knife, so you have a total of 6 layers.
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Place your first layer face-up on the board (or plate) and cover with 1/5 of the Whipped Birthday Cake leaving about 1/2" around the edge and cover with a thin layer of your favourite sprinkle mix.
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Repeat until you come to your final layer, which you will place face-down. If you find the cake too soft and unstable, put in refrigerator for a few moments to firm it up, then resume.
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Using a turntable, if possible, frost entire outside of cake with a thin layer of Malted Belgian Chocolate Frosting to seal in crumbs. Chill until firm. Repeat with another layer of frosting, this time working to get the frosting as smooth as possible. Place cake on a cookie sheet and carefully press your sprinkle mix onto sides, letting the excess fall down onto the cookie sheet. You can cover sides completely or leave 1/3 exposed (as in photo). Once you are pleased with your sprinkled sides, fill a medium or large pastry bag fitted with pastry tip 1M with the remaining frosting (about 2/3 full) and pipe border around the top of cake. Chill until firm.
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Take cake from fridge and cover the top with a layer of your sprinkle mixture, using a toothpick to push sprinkles in between piping. Once frosting softens again, the sprinkles will adhere to top.
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Serve cake at room temperature, but keep refrigerated if not serving the day it's made.