Graduation Sheet Cake Buttercream (Print Version)

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

# Components:

→ 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

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 and line a 12x18-inch sheet cake pan with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt.
03 - In a large bowl, beat 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 just until 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.
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; leave remaining white for base layer.
10 - Spread a thin layer of white buttercream over the cooled cake to create a smooth base.
11 - Fit piping bags with petal tips for roses and leaf tips for foliage. Pipe roses and leaves across the cake, focusing on corners and borders.
12 - Using a small round piping tip, add 'Congratulations' or personalized graduation message to cake.

# Expert Advice:

01 -
  • It feeds a crowd: Twenty-four servings means you're covered for a party, gathering, or even just a week of sneaking slices from the fridge.
  • The decoration doubles as the fun part: Piping roses feels like playing, not working, and your guests will genuinely be impressed.
  • You can make it days ahead: Bake the cake one day, frost and decorate the next—stress-free scheduling for any celebration.
02 -
  • Cake batter temperature matters more than you'd think: Ingredients that are truly room temperature emulsify better and create a finer crumb; cold ingredients create separation and dense spots.
  • Don't frost a warm cake: I learned this the hard way when I tried to save time—the frosting melted and slid right off, and I spent an extra hour cleaning up my mistake.
  • Gel coloring is your friend: Liquid food coloring adds moisture and makes your buttercream weep and separate; gel stays stable and keeps colors vibrant.
03 -
  • Room temperature is the unsung hero: Every single ingredient should feel warm to the touch; invest two minutes in that step and your cake will thank you with a perfect crumb.
  • The offset spatula is your best friend for frosting: A regular knife will drag and pull, but an offset spatula glides smoothly, creating a professional finish with minimal effort.
  • If your piping bag starts to lose pressure, it's full of air: Twist the top to force frosting toward the tip and eliminate pockets that create weak lines.
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