01 -
Arrange oven racks in upper and lower thirds and preheat to 175°C. Grease an 8-inch round cake pan and an 8-inch ovenproof bowl with cooking spray. Dust both with flour, tapping out excess.
02 -
In a large bowl, prepare cake batter according to package directions. Pour a little more than half the batter into the prepared bowl and the remainder into the prepared pan.
03 -
Bake both pan and bowl, rotating top to bottom halfway through, until cake in pan is cooked and a tester comes out clean, about 25 minutes.
04 -
Continue baking the cake in the bowl until a tester inserted in the center comes out clean, approximately 10 additional minutes. Invert both cakes onto a wire rack and let cool.
05 -
Tint frosting with blue gel food coloring until desired shade is reached. Level domed sides of cakes with a serrated knife. Spread frosting over the top and sides of the cake baked in the pan. Place cake baked in the bowl on top, flat side down, and frost entire structure ensuring full coverage.
06 -
Using frosting as adhesive, attach one donut half to the bottom edge of the cake. Cover with frosting, then attach the second donut half to extend the entryway, covering it with frosting as well.
07 -
Cut large marshmallows in half lengthwise using kitchen shears. Starting at the cake base, press cut sides into frosting in neat rows, packing closely until reaching the top.
08 -
Snip mini marshmallows in half lengthwise and press them into the frosting on the exterior of the entryway.
09 -
Decorate with crushed blue rock candy as desired. Lightly dust confectioners' sugar over the top to simulate snow.