Simple First Communion Sheet Cake (Printable)

A moist vanilla sheet cake adorned with smooth buttercream and delicate piped flowers.

# What You'll Need:

→ Sheet Cake

01 - 2 1/2 cups all-purpose flour
02 - 2 1/2 teaspoons baking powder
03 - 1/2 teaspoon salt
04 - 1 cup unsalted butter, softened
05 - 2 cups granulated sugar
06 - 4 large eggs, room temperature
07 - 1 tablespoon pure vanilla extract
08 - 1 cup whole milk, room temperature

→ Buttercream Frosting

09 - 1 1/2 cups unsalted butter, softened
10 - 6 cups powdered sugar, sifted
11 - 1/4 cup whole milk
12 - 2 teaspoons pure vanilla extract
13 - Food coloring in pink, yellow, and green

# How to Make It:

01 - Preheat oven to 350°F. Grease a 9x13-inch baking 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 with an electric mixer until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time to the butter mixture, mixing well after each addition. Mix in vanilla extract until fully combined.
05 - Add flour mixture in three additions, alternating with milk, beginning and ending with flour. Mix until just combined; avoid overmixing.
06 - Transfer batter into prepared pan and smooth the top with a spatula for even baking.
07 - Bake for 28 to 32 minutes, or until a toothpick inserted in the center emerges clean.
08 - Allow cake to cool in pan for 10 minutes, then turn out onto a wire rack to cool completely before frosting.
09 - Beat softened butter until creamy. Gradually add sifted powdered sugar, alternating with milk, beating until smooth and fluffy. Mix in vanilla extract.
10 - Divide buttercream into separate bowls and tint portions with gel food coloring for flowers and leaves.
11 - Spread a generous layer of plain buttercream over the cooled cake as the foundation layer.
12 - Fill piping bags fitted with flower and leaf tips with colored buttercream. Pipe flowers and leaves decoratively across the cake, concentrating on corners and edges for a classic presentation.
13 - Optionally, pipe a cross or add First Communion text using a small round piping tip as desired.

# Expert Tips:

01 -
  • The cake stays impossibly moist for days, so you can actually bake it ahead without stress.
  • Piping buttercream flowers looks fancy but teaches you a real decorating skill that works on every cake you'll make going forward.
  • It feeds a crowd without feeling fussy, which is exactly what a celebration cake should do.
02 -
  • Room temperature ingredients are not a suggestion—cold butter won't cream properly and cold eggs won't emulsify, both of which crack your cake's structure from the inside.
  • Overmixing after adding flour is the silent killer of tender cakes; stop as soon as you don't see streaks and trust that the spatula will finish the job.
03 -
  • Use gel food coloring instead of liquid—it won't thin your buttercream and the colors stay vibrant without turning muddy or runny.
  • If you mess up a flower, just smooth over it with a spatula and start again; buttercream is forgiving and no one will see your practice attempts under the gorgeous final result.
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