Mix cake according to manufacturer’s instructions. Deposit 1 pound of prepared batter into sprayed and papered 8-inch cake pans. Bake at 350°F until cake springs back lightly when touched. Let cool completely. Each cake will use 3 layers.
Fill, crumb coat, and ice with white buttercreme, using a cake comb to finish. Fill a piping bag fitted with a large star tip with green buttercreme and a second bag fitted with a small star tip with yellow. Pipe a tree design on the front and immediately lay on snowflake and candy cane sprinkles to decorate. Pipe 12 large green rosettes on the top of the cake. Pipe a yellow “star” at the top of the tree. Dust on the “snow” with donut sugar.
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