Step 1: Prepare the Cake Base

• Preheat your oven to 350°F (175°C).
• Line two 9-inch round cake pans with parchment paper and grease the sides.
• In a mixing bowl, sift together flour, baking powder, and salt. Set aside.
• In another large bowl, cream the butter and sugar until light and fluffy (about 3 minutes).
• Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
• Alternate adding the dry ingredients and milk to the butter mixture, starting and ending with the dry ingredients. Mix until just combined.
• Divide the batter evenly between the two pans and smooth the tops.
• Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
• Let the cakes cool in the pans for 10 minutes, then transfer them to a wire rack to cool completely.

Step 2: Prepare the Decoration

Coloring the Frosting

• Divide the buttercream frosting into two portions. Color one portion red and the other blue using gel food coloring.
• Prepare black royal icing for the web details.

Assembling the Cake

• Level the cake layers using a serrated knife or cake leveler.
• Place one cake layer on the turntable and spread a thin layer of frosting on top. Add the second layer and crumb-coat the entire cake with a thin layer of frosting. Chill for 15 minutes.
• Apply the final layer of frosting: red on top and blue on the sides, blending the edges smoothly.

Adding the Spiderman Design

• Use black royal icing and a piping bag with a fine tip to create the web pattern. Follow a web stencil or freehand the design.
• Roll out white fondant to create Spiderman’s eyes. Place them on the cake in a central position.
• Add additional details, like Spiderman logos or cityscapes, using fondant or edible markers.