Graduation Sheet Cake Buttercream (Printable)

Soft vanilla cake topped with creamy buttercream and colorful piped roses, perfect for festive occasions.

# 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 for roses and leaves

# Step-by-Step:

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, cream butter and sugar together using an electric mixer 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 until fully combined.
05 - Alternately add flour mixture and milk to the creamed mixture, beginning and ending with flour. Mix just until combined, avoiding overmixing.
06 - Pour batter into prepared pan and smooth the top. Bake for 30 to 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 removing from pan.
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; tint portion green for leaves; reserve white buttercream for base.
10 - Spread a thin layer of white buttercream over the cooled cake to create a smooth foundation.
11 - Fit piping bags with desired tips including petal tip for roses and leaf tip for leaves. Pipe roses and leaves across the cake, focusing on corners and borders.
12 - Using a small round piping tip, add a congratulatory message or personalized graduation greeting on the cake.

# Expert Suggestions:

01 -
  • The cake stays impossibly moist and tender, even if you finish it a day later.
  • Buttercream piping is a learnable skill that makes you look like a professional baker without needing to be one.
  • You can customize everything—colors, messages, flower styles—to match exactly who you're celebrating.
02 -
  • Ingredients must be room temperature or your batter will break, resulting in a grainy, disappointing cake instead of the tender crumb you're expecting.
  • Don't overmix once you start alternating the flour and milk—mix just until you see no streaks of flour, then stop immediately or the cake will taste tough and dense.
  • Gel food coloring is absolutely worth the small effort to find because liquid coloring will thin out your buttercream and make piping nearly impossible.
03 -
  • If your buttercream is too soft, chill it for 10 minutes before piping; if it's too stiff, add a tablespoon of milk and re-beat until it's spreadable and pumpable.
  • Keep a damp cloth nearby while piping—wiping your piping tip between roses keeps everything clean and your lines sharp.
  • The cake tastes even better on day two after the flavors have settled, so don't stress if you're making it ahead.
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