Graduation Sheet Cake Buttercream (Printer-friendly)

Moist vanilla sheet cake with smooth buttercream and decorative piped roses for special occasions.

# What You 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 Frosting

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

# Steps:

01 - Set oven to 350°F. Grease and line a 12x18-inch sheet pan with parchment paper, ensuring corners are properly sealed.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt until evenly distributed.
03 - In a large bowl using an electric mixer, beat softened butter and granulated sugar until pale and fluffy, approximately 3-4 minutes.
04 - Add eggs one at a time to the butter mixture, beating well after each addition. Mix in vanilla extract until fully incorporated.
05 - Add dry flour mixture and milk alternately to the creamed mixture, beginning and ending with flour. Mix until just combined to avoid overdeveloping gluten.
06 - Transfer batter to prepared pan and smooth the surface. Bake for 30-35 minutes until a toothpick inserted in the center emerges clean. Cool completely on a wire rack in the pan.
07 - Beat softened butter until creamy. Gradually add sifted powdered sugar, then milk and vanilla extract. Continue beating for approximately 5 minutes until smooth and fluffy.
08 - Divide buttercream into separate bowls. Tint portions with gel food coloring for roses (red, pink, yellow hues) and foliage (green), reserving white frosting for base layer.
09 - Spread a thin, even layer of white buttercream across the cooled cake to create a smooth foundation for piped decorations.
10 - Fill piping bags with appropriately sized tips. Pipe roses and leaf designs across cake surface, concentrating decoration at corners and borders for visual balance.
11 - Using a small round piping tip, inscribe a congratulatory message or personalized graduation greeting on the cake surface.

# Top Tips:

01 -
  • The cake stays moist and tender for days, so you can bake it ahead without stress.
  • Those piped roses look impossibly fancy but honestly get easier after your third attempt, and nobody's judging your first ones anyway.
  • It feeds a crowd without requiring you to bake multiple smaller cakes, which saves your sanity on event day.
02 -
  • Butter and eggs at room temperature aren't just a suggestion—they're the difference between a beautiful fluffy cake and a gritty, dense one that looks defeated.
  • Overmixing the final batter is how you accidentally turn vanilla cake into something chewy and tough, so listen for when the flour streaks disappear and then stop immediately.
  • Gel coloring really does matter for buttercream because liquid food coloring adds moisture and thins out your frosting, making it impossible to pipe clean roses.
03 -
  • Make a test batch of buttercream roses on parchment paper a day or two before you decorate the actual cake so you can practice without pressure and learn what tip pressure feels right.
  • Chill your piping bags and tips in the freezer for 15 minutes before you start decorating—cold tools create cleaner, more defined roses that hold their shape better.
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