Simple Buttercream Flower Cake (Printable)

Moist vanilla sheet cake with smooth buttercream and delicate flower decorations. Perfect for special occasions.

# 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

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 as desired

# Method:

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.
03 - In a large bowl, beat butter and sugar with an electric mixer until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, mixing well after each addition. Mix in vanilla extract.
05 - Add flour mixture in three parts, alternating with milk, beginning and ending with flour. Mix until just combined without overmixing.
06 - Pour batter into prepared pan and smooth the top with a spatula.
07 - Bake for 28 to 32 minutes, or until a toothpick inserted in the center comes out clean.
08 - Let cake cool in pan for 10 minutes, then turn out onto a wire rack to cool completely.
09 - Beat butter until creamy. Gradually add powdered sugar, alternating with milk, beating until smooth and fluffy. Mix in vanilla extract.
10 - Divide buttercream into bowls and tint portions with food coloring for flowers and leaves.
11 - Spread a generous layer of plain buttercream over cooled cake as the base.
12 - Fill piping bags fitted with flower and leaf tips with colored buttercream. Pipe flowers and leaves decoratively across the cake, focusing on corners and edges.
13 - Optionally, pipe a cross or add First Communion text with a small round tip.

# Expert Advice:

01 -
  • The cake stays impossibly moist for days, so you can bake it ahead without stress.
  • Buttercream flowers are easier than you think once you understand the piping motion—it's genuinely forgiving.
  • You get to customize colors to match the celebration without buying a themed cake from a bakery.
02 -
  • Room temperature ingredients aren't a suggestion—they're the difference between a smooth batter and one that looks curdled and broken.
  • Overmixing the batter after adding flour is the enemy; mix just until you don't see streaks of dry flour and stop, even if it doesn't look completely smooth.
  • If your buttercream is too soft to pipe, refrigerate it for 15 minutes; if it's too stiff, add a touch more milk and mix gently.
03 -
  • Invest in gel food coloring—it won't thin your buttercream like liquid coloring does, giving you more stable frosting that pipes beautifully and holds its hue.
  • A turntable makes frosting easier by letting you rotate the cake while you work, but it's not essential; a lazy Susan works in a pinch.
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