It's hard to improve on the fun of a confetti cake, but baking the layers in a doughnut pan leaves you with a hole in the center that you can fill with chocolate pudding -- a sweet surprise that we think might do it!
Preheat the oven to 350 degrees F. Spray a 6-cavity nonstick doughnut pan with nonstick spray.
Prepare the cake batter according to the directions on the box. Transfer 3/4 cup batter to a liquid measuring cup and pour among the cavities of the doughnut pan, dividing evenly (reserve the remainder of the batter for another use; see Cook's Note). Tap the pan several times on the counter to smooth out the batter. Bake until a toothpick comes out clean, 5 to 6 minutes.
Remove the cake layers from the pan to a rack and cool completely.
Place a large dollop of frosting on a plate. Top with a cake layer, then frost the top, leaving the hole unfrosted. Top with a second cake layer and frost its top in the same manner. Top with a third cake layer. Using a small spoon, carefully dollop 2 tablespoons chocolate pudding into the center of the cake. Frost the sides of the cake, adding extra frosting to fill in the rounded edges for a straight-sided cake. Frost the top of the cake and garnish with 1 tablespoon sprinkles.
Repeat with the remaining frosting, cake layers, chocolate pudding and sprinkles to make a second cake.
You will have enough batter leftover to bake a 9-inch square cake.
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