Simple Graduation Sheet Cake (Printable version)

Moist vanilla sheet cake with creamy buttercream and vibrant graduation-themed piping decorations.

# What you need:

→ Cake

01 - 2½ cups all-purpose flour
02 - 2½ teaspoons baking powder
03 - ½ teaspoon salt
04 - 1 cup unsalted butter, softened
05 - 1¾ cups granulated sugar
06 - 4 large eggs, room temperature
07 - 1 tablespoon vanilla extract
08 - 1 cup whole milk, room temperature

→ Buttercream Frosting

09 - 1 cup unsalted butter, softened
10 - 4 cups powdered sugar, sifted
11 - ¼ cup whole milk
12 - 2 teaspoons vanilla extract
13 - Pinch of salt
14 - Food coloring for school colors

→ Decoration

15 - Additional food coloring for piping Class of 2026
16 - Sprinkles or edible decorations as desired

# Steps to follow:

01 - Preheat oven to 350°F. Grease a 9x13-inch sheet pan and line with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
03 - In a large bowl, beat softened butter and sugar together until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract until fully combined.
05 - Gradually add flour mixture in three parts, alternating with milk, beginning and ending with flour. Mix until just combined, avoiding overmixing.
06 - Pour batter into prepared pan and smooth the top. Bake for 30–35 minutes, or until a toothpick inserted into the center comes out clean.
07 - Cool cake completely in the pan on a wire rack before frosting.
08 - Beat softened butter until creamy. Gradually add powdered sugar, milk, vanilla, and salt. Beat for 3–5 minutes until fluffy and light. Divide and tint portions with food coloring as desired.
09 - Spread an even layer of buttercream over the cooled cake using a spatula.
10 - Transfer colored buttercream into a piping bag fitted with a small round tip. Pipe Class of 2026 on top of cake. Add sprinkles or additional edible decorations as desired.

# Expert tips:

01 -
  • The cake stays moist for days, so you can bake it ahead without stress when graduation parties get hectic.
  • Buttercream frosting is forgiving and actually gets better when you take your time beating it—no fancy equipment required beyond what most kitchens have.
  • The whole thing feeds 16 people from one pan, which means fewer desserts to juggle on serving day.
02 -
  • Room temperature ingredients are non-negotiable—they blend together smoothly without breaking or creating lumps, which is why the cake comes out tender instead of dense.
  • Don't overmix the final batter once you've added the flour—mix just until combined because overworking develops gluten, turning your cake tough and chewy instead of light and fluffy.
03 -
  • If your frosting breaks or looks curdled while mixing, it usually means the butter was too cold or you added too much liquid at once—start fresh with softened butter and add everything more gradually next time.
  • Use a bench scraper or offset spatula to create smooth frosting, and if you want perfectly straight piping lines, lightly score where you want the text to go first with a toothpick as a guide.
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