Buttercream Roses Diploma Cake (Printable)

Crowd-pleasing cake with buttercream roses and diploma details. Perfect centerpiece for graduation celebrations.

# What You'll Need:

→ Cake

01 - 3 cups all-purpose flour
02 - 2 1/2 cups granulated sugar
03 - 1 cup unsalted butter, softened
04 - 1 cup whole milk, room temperature
05 - 6 large eggs, room temperature
06 - 1 tablespoon vanilla extract
07 - 2 1/2 teaspoons baking powder
08 - 1/2 teaspoon salt

→ Buttercream Frosting

09 - 2 cups unsalted butter, softened
10 - 8 cups powdered sugar, sifted
11 - 1/2 cup whole milk or heavy cream
12 - 2 teaspoons vanilla extract
13 - Food coloring (gel preferred), as needed for roses, leaves, and diploma

→ Decorations

14 - Edible gold or silver pearls (optional, for accents)
15 - Fondant or white chocolate for diploma and ribbon (optional)

# Directions:

01 - Preheat oven to 350°F. Grease and line a 12x18-inch sheet cake pan with parchment paper.
02 - In a large bowl, beat butter and sugar with an electric mixer until light and fluffy, about 3 minutes.
03 - Add eggs one at a time, mixing thoroughly after each addition. Stir in vanilla extract.
04 - In a separate bowl, whisk together flour, baking powder, and salt.
05 - Add flour mixture to butter mixture in three batches, alternating with milk and beginning and ending with flour. Mix until just combined.
06 - Pour batter into prepared pan and smooth the surface. Bake for 28–32 minutes, until a toothpick inserted in the center comes out clean.
07 - Cool cake in pan for 10 minutes, then turn onto a wire rack to cool completely.
08 - Beat butter until creamy. Gradually add sifted powdered sugar, vanilla, and milk, mixing until fluffy. Adjust consistency with additional milk or sugar if necessary.
09 - Divide buttercream into bowls for coloring. Tint portions pink, red, or yellow for roses; green for leaves; leave some white for base frosting.
10 - Coat cooled cake with a smooth layer of white buttercream using an offset spatula.
11 - Using a piping bag fitted with a rose tip, pipe buttercream roses in desired colors. Create leaves using a leaf tip.
12 - Shape fondant or white chocolate into a scroll for the diploma, tie with a colored fondant ribbon, and place on cake.
13 - Adorn cake with edible pearls and any additional decorations as desired.

# Expert Tips:

01 -
  • The buttercream here pipes like a dream, so you can decorate even if it's your first try.
  • The sheet cake stays extra moist, making it a hit at any celebration—no dry corners.
02 -
  • If you try to frost the cake before it’s fully cool, the buttercream slides and melts—patience is everything!
  • I learned the hard way that rushed piping can smudge roses, so always practice a few on parchment before the real thing.
03 -
  • Let the butter soften at room temperature—never microwave, or it loses its structure for frosting.
  • Piping roses onto parchment first then lifting them onto the cake gives you more control, especially under pressure.
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