Graduation Sheet Cake Buttercream (Printable)

Moist vanilla sheet cake decorated with colorful buttercream roses and leaves for a festive centerpiece.

# What You'll Need:

→ 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

→ Buttercream Frosting

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 and line a 12x18-inch sheet cake pan with parchment paper for easy removal.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
03 - In a large bowl, beat butter and sugar together until light and fluffy, approximately 3-4 minutes using an electric mixer.
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 to avoid overmixing.
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 - Allow cake to cool completely in the pan on a wire rack before frosting.
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 (red, pink, yellow) and leaves (green), leaving some white for the base layer.
10 - Spread a thin layer of white buttercream over the cooled cake to create a smooth base for decorating.
11 - Fit piping bags with petal tips for roses and leaf tips for foliage. Pipe roses and leaves across the cake surface, focusing on corners or creating a border pattern.
12 - Using a small round piping tip, write 'Congratulations' or a personalized graduation message on the cake.

# Expert Advice:

01 -
  • It's one of those cakes that looks fancy enough to impress a room full of people, but the actual baking part is just a straightforward vanilla cake.
  • Buttercream roses are easier than they seem once your hands understand the motion, and that moment when it clicks feels genuinely magical.
  • You get to customize colors and messages, so every cake becomes its own small celebration tailored to whoever you're honoring.
02 -
  • Gel food coloring is absolutely worth the extra trip to the store—liquid coloring will thin out your buttercream and turn everything into a watery mess.
  • If your buttercream is too soft to pipe, pop it in the fridge for 15 minutes; if it's too stiff, warm it slightly or add a tiny bit more milk, because piping firm frosting is actually harder than it sounds.
03 -
  • If you're making this ahead, bake the cake and store it wrapped at room temperature for a day or two, then frost it the morning of the celebration—less stress and fresher taste.
  • A small offset spatula is worth owning just for this recipe; it makes spreading the crumb coat smooth and professional-looking without a lot of effort.
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