Graduation Sheet Cake Buttercream (Print-Friendly)

Moist vanilla sheet layered with smooth buttercream and colorful piped roses for an elegant finish.

# What You'll Need:

→ Sheet Cake

01 - 3 cups all-purpose flour
02 - 2.5 teaspoons baking powder
03 - 0.5 teaspoon baking soda
04 - 0.5 teaspoon salt
05 - 1 cup unsalted butter, room temperature
06 - 2 cups granulated sugar
07 - 4 large eggs, room temperature
08 - 1 tablespoon vanilla extract
09 - 1.25 cups whole milk, room temperature

→ Buttercream

10 - 1.5 cups unsalted butter, room temperature
11 - 6 cups powdered sugar, sifted
12 - 0.25 cup whole milk
13 - 2 teaspoons vanilla extract
14 - Gel food coloring in assorted colors for decoration

# How To Make It:

01 - Preheat oven to 350°F. Grease a 12x18-inch sheet cake pan and line with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt.
03 - In a large bowl, cream butter and sugar together until light and fluffy, approximately 3 to 4 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract.
05 - Alternately add flour mixture and milk to the creamed mixture, beginning and ending with flour. Mix until just combined.
06 - Pour batter into prepared pan and smooth the top. Bake for 30 to 35 minutes until a toothpick inserted in the center comes out clean.
07 - Cool cake completely in the pan on a wire rack.
08 - Beat butter until creamy. Gradually add powdered sugar, then milk and vanilla. Beat until smooth and fluffy, approximately 5 minutes.
09 - Divide buttercream into separate bowls. Tint portions with gel food coloring for roses in red, pink, and yellow, and green for leaves. Reserve white buttercream for base.
10 - Spread a thin layer of white buttercream over the cooled cake to create a smooth base.
11 - Fit piping bags with petal tips for roses and leaf tips for leaves. Pipe roses and leaves across the cake, focusing on corners or borders.
12 - Using a small round piping tip, pipe a congratulatory or personalized graduation message on the cake.

# Expert Advice:

01 -
  • The cake stays incredibly moist for days, so you can actually bake it ahead and not stress on party day.
  • Those piped roses look like you hired a professional baker, but they're way easier to master than you'd think.
  • One sheet cake feeds a crowd, which means you're celebrating with fewer dishes and way more joy.
02 -
  • Don't frost a warm cake—I learned this the hard way when my frosting turned into soup and slid into my lap; patience here saves your sanity and your cake.
  • Room-temperature ingredients are absolutely essential, not just a suggestion—cold eggs and butter won't emulsify properly and your cake will be dense and grainy.
  • Gel food coloring is worth hunting for; liquid dyes thin the buttercream and make your colors muddy and pale.
03 -
  • Use an offset spatula and a turntable if you have one—they make spreading buttercream smooth and even, which lets your piped flowers be the star.
  • Practice your roses on parchment paper with leftover frosting before you pipe on the actual cake; a few practice runs erase the nervousness.
  • Add a touch of champagne or almond extract to the buttercream for a subtle depth that makes people wonder what your secret is.
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