HEAT oven to 350ºF. PREPARE cake batter and bake in 2 (9-inch) round pans as directed on package. Cool cakes in pans 10 min. Invert onto wire racks; gently remove pans. Cool cakes completely.

Divide the batter evenly between the two prepared ... spatula to bring the frosting down the sides of the cake until it's fully covered. Use a bench scraper to smooth the sides of the cake and ...

The batter is straightforward ... so be sure to keep a close eye. Storing the cake properly, preferably in an airtight container or covered with plastic wrap, also helps retain its moisture.