Graduation Sheet Cake Buttercream (Printable)

Moist vanilla sheet cake topped with silky buttercream and decorated with colorful piped roses.

# What you need:

→ For the Sheet Cake

01 - 3 cups all-purpose flour
02 - 2½ teaspoons baking powder
03 - ½ teaspoon baking soda
04 - ½ 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 - 1¼ cups whole milk, room temperature

→ For the Buttercream

10 - 1½ cups unsalted butter, room temperature
11 - 6 cups powdered sugar, sifted
12 - ¼ cup whole milk
13 - 2 teaspoons vanilla extract
14 - Gel food coloring in assorted colors

# Directions:

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. Set aside.
03 - In a large bowl using an electric mixer, cream butter and sugar together until light and fluffy, approximately 3-4 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 30-35 minutes, or until a toothpick inserted in the center comes out clean.
07 - Cool cake completely in the pan on a wire rack before decorating.
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, leaves, and other decorative elements.
10 - Spread a thin layer of white buttercream over the cooled cake to create a smooth foundation.
11 - Fit piping bags with desired tips. Pipe roses and leaves across the cake, focusing on corners or borders.
12 - Using a small round piping tip, add a graduation message or congratulatory text to the cake.

# Expert tips:

01 -
  • The vanilla cake stays moist for days, so you can bake it ahead without stress.
  • Those piped roses make it look like you spent hours in a bakery, but honestly, it's more forgiving than you'd think.
02 -
  • Don't rush the cooling phase—I once tried frosting a barely-cooled cake and watched the buttercream melt into sadness before my eyes.
  • Gel food coloring is genuinely worth seeking out because liquid coloring dilutes your buttercream and turns colors muddy, making piping roses feel impossible.
03 -
  • Room temperature ingredients are non-negotiable—take them out of the fridge 30 minutes before you start, and your cake will thank you with a better crumb.
  • Invest in an offset spatula; it's the difference between frosting that looks spread-on and frosting that looks intentional and smooth.
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