Trim a thin layer of both cakes to level them with a serrated knife to ensure they stack evenly.
Place a small amount of frosting on the center of your cake stand or serving plate.Place one layer of the cake on the prepared cake stands or plate.
Using an offset spatula or butter knife, spread a generous layer of frosting (at least 5-6 scoops) evenly over the top of the first cake layer. Smooth it out to ensure an even surface.
Carefully place the second cake layer on top of the frosted first layer. Align it as evenly as possible.
Apply a crumb coat by spreading a thin layer of frosting over the entire cake. This layer seals in any crumbs and creates a smooth surface for the final coat. Chill the cake in the refrigerator for about 30 minutes.
After the crumb coat has been set, apply the final layer of frosting. Smooth it out with the offset spatula.
For a clean finish, you can use a bench scraper to smooth the sides.
If desired, use a piping bag to pipe rosettes or borders, to the top and sides of the cake.
Refrigerate the assembled cake for at least 30 minutes to allow the frosting to set and make slicing easier.
Once the cake is chilled and the frosting is set, remove it from the refrigerator and let it come to room temperature for about 10-15 minutes before serving. This allows the flavors to fully develop.