Inspired by the serene beauty of the turquoise birthstone, this vanilla cake captures a dreamy sky with soft blue hues and fluffy buttercream clouds. Light, airy, and visually stunning, it’s a peaceful yet playful dessert perfect for December birthdays or anyone who loves a slice of sky on their plate.
Heat oven to 350°F. Grease and flour two 6-inch round cake pans.
Prepare cake batter as directed on the package. Divide batter evenly between pans.
Bake 35 to 40 minutes, or until a toothpick inserted into the center comes out clean. Cool 10 minutes; remove from the pans and place on a cooling rack. Cool 30 minutes at room temperature. Place cake layers in the freezer for 20 to 30 minutes or until chilled but not completely frozen.
In a large bowl, beat softened butter with an electric mixer on medium-low speed for 2 to 3 minutes or until smooth and creamy. Add powdered sugar in batches, beating until smooth after each addition. Add vanilla, beat until well blended.
Place 1/2 cup of the frosting into a piping bag; set aside. Add 3 drops of the blue gel food color and 2 drops of the green gel food color to the remaining frosting; mix thoroughly.
Using a serrated knife or a cake leveler, cut rounded tops off cake layers to create a level surface.
Spread a layer of the turquoise frosting on top of one of the cake layers; top with the second cake layer. Spread a thin coat of turquoise frosting over the entire cake to lock in the crumbs. Freeze for 10 minutes.
Frost the entire cake with another coat of turquoise frosting.
Cut the tip off the piping bag containing the white frosting. Pipe 3 to 4 circles in a cluster on the side of the cake. Use a small offset spatula to smooth the frosting into the shape of a cloud. Repeat as desired on the side and top of the cake to create the look of the sky.
