A blizzard of marshmallow petals coated in glittering white sugar and dotted with pearlized candies makes this layer cake a spectacular finish to a holiday meal. And because the flowers can be made ahead of time, it is also a perfect DIY wedding cake.
For Perfect Cake Mix:
Preheat the oven to 350°F. Line muffin cups with paper liners or line the bottom of the pan(s) with waxed paper to fit and spray with nonstick cooking spray.
Following the box’s instructions, combine all the ingredients in a large bowl: use the buttermilk in place of the water specified (the box will call for more water than the buttermilk here), use the amount of oil called for on the box (typically, white or yellow cake calls for 1 ⁄3 cup; chocolate cakes call for ½ cup), and add the 4 eggs. Beat with an electric mixer on low speed until moistened, about 30 seconds. Increase the mixer speed to high and beat until thick, 2 minutes longer.
Using the chart on the opposite page, divide the batter between the pans, smooth the top(s), and follow the indicated baking times. Bake until golden and a toothpick inserted in the center comes out clean.
Transfer the cake(s) to a wire rack and cool for 15 minutes. Invert, lift off the pan(s), and cool completely.
Cakes or cupcakes that are not used immediately may be wrapped in plastic wrap and frozen for up to 2 weeks.
For Almost-Homemade Vanilla Buttercream:
In a large mixing bowl, beat the butter with an electric mixer on medium speed until light and fluffy. Add the marshmallow creme and beat until smooth, scraping down the sides of the bowl. Add the confectioners’ sugar and vanilla extract and beat until light and fluffy. If the mixture seems too stiff , soften in the microwave for no more than 10 seconds and beat again until smooth.
Taste, and add up to 1 cup more confectioners’ sugar, if desired, for sweetness (the frosting may be tinted at this time).
For assembly:
For the flowers, place the white decorating sugar in a medium bowl. Make the petals for the large flowers by cutting the large marshmallows crosswise into 5 thin slices, allowing the pieces to fall into the sugar. Shake the bowl and press the cut sides of the marshmallows into the sugar to coat. Make the petals for the small flowers by cutting the mini marshmallows in half on the diagonal, then coat in sugar as above. Remove the sugared marshmallow petals and store in an airtight container.
Line three cookie sheets with waxed paper. Place the white candy melts in a ziplock bag (do not seal the bag). Microwave for 10 seconds to soften, massage the wafers in the bag, return to the microwave, and repeat the process until smooth, about 30 seconds. Press out the excess air and seal the bag. Snip a small (1 ⁄8-inch) corner from the bag. For the large flowers, pipe a dot of melted candy about the size of a dime onto the waxed paper and arrange 5 large marshmallow slices, sugared side up, in the shape of a flower in the dot of melted candy (see photo). Repeat to make 12 flowers. Refrigerate for 5 minutes, or until the candy is set. For the small flowers, pipe a dot of melted candy the size of a bean onto the waxed paper. Arrange 5 mini marshmallow pieces, sugared side up, in the shape of a flower on top of the melted candy. Repeat to make 50 flowers. Refrigerate for 5 minutes, or until the candy is set. (The flowers can be made up to this point and stored in an airtight container for up to 1 week.)
Spoon ¼ cup of the vanilla frosting into a ziplock bag. Place one 8-inch cake layer on a work surface. Use toothpicks around the outer edge of the cake to mark the cake into 3 layers. Cut the cake horizontally into layers with a serrated knife, using the toothpicks as a guide. Repeat with the other 8-inch cake. Cut the smaller cake into 4 layers.
Transfer one 8-inch cake layer to a serving platter. Spread a scant 1 ⁄3 cup of the remaining vanilla frosting on top of the cake. Place another layer on top and repeat the process 4 times, ending with frosting, to make 6 layers. Spread a thin coating of vanilla frosting on the side of the cake to smooth. Place a 5½-inch cake layer on a serving plate. Spread a scant ¼ cup vanilla frosting on top. Place another layer of cake on top and repeat the process 2 times, ending with frosting, to make 4 layers. Spread a thin coating of vanilla frosting on the side of the cake to smooth and fill any gaps. Refrigerate both cakes until set, about 1 hour.
Place the small cake on top of the large cake. Spread the remaining vanilla frosting on top of the cake and smooth. Snip a small corner from the bag with the vanilla frosting. Carefully peel the large and small flowers from the waxed paper. Arrange the flowers as desired on the top and sides of the cake, adding some vanilla frosting, if necessary, to secure. Pipe small dots of vanilla frosting in the center of the flowers and add the pearl candies, using 3 for each large flower and 1 for each small flower.
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