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Step 1: Trim the Cake
A rotating turntable makes cake decorating much easier; if you don't have one, use a plate on an inverted bowl. Place one layer on an 8-inch cardboard round; place the round on the turntable, securing it with a dab of buttercream. With a long serrated knife, trim tops off both cake layers to make flat surfaces.
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Step 2: Spread Filling
Using a small offset spatula, evenly cover the top of the first layer with 1 cup of buttercream. Spread the buttercream so it extends beyond the edges of the cake.
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Step 3: Crumb Coat
Place the other cake layer, with the cut side down, on top of the buttercream; press gently to make it level. With the small spatula, spread the cake with 1 1/2 cups more of the buttercream, plus any oozing out from between the layers, creating a "crumb coat," a thin layer of frosting that seals in the crumbs. Refrigerate the cake for 15 minutes.
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Step 4: Frost the Cake
Using a large offset spatula, generously coat the chilled cake with 2 1/2 cups of buttercream, frosting the top of the cake first. Hold the spatula at a 45-degree angle against the cake, as shown, and slowly rotate the turntable. If the buttercream appears to be streaky, dip the spatula into hot water, and wipe it dry, then continue spreading the frosting.
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Step 5: Smooth Frosting
Use a bench scraper to smooth the sides of the cake. Hold the scraper perpendicular to the cake with one edge resting on the turntable and slowly rotate the turntable. Small areas of the cake may be touched up with the small spatula. Refrigerate the cake for 30 minutes.
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Step 6: Mark Cutting Lines
Cut an 8-inch round from parchment paper. Fold the round into 16 equal wedges by folding it in half 4 times. Unfold, and place the paper on top of the chilled cake. Using the fold lines as a guide, lightly mark 16 vertical lines around the sides of cake with the bench scraper.
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For a decorative finish, try piping on cheery daisies with green, yellow, and untinted frostings.