Ingredients
Equipment
Method
Prep the pans and dry mix
- Preheat the oven to 350°F and line two 9-inch round cake pans with parchment paper, then set them on a sheet pan for stability.
- Sift together the flour, baking powder, and salt until evenly blended, then spread it out briefly so it cools slightly before mixing.
Make the red and blue cake batter
- Cream the butter and sugar until light and fluffy, about 3 minutes, then scrape the bowl so the mixture stays smooth.
- Add the eggs one at a time and stir until incorporated, then mix in the vanilla extract.
- Alternate adding the dry ingredients and milk, mixing until just combined to keep the crumb tender.
- Divide the batter into two bowls and tint one red and one blue with gel food coloring, then stir until the color is uniform.
Bake and cool the layers
- Pour each batter into a prepared pan and bake for 25 to 30 minutes at 350°F, until a toothpick comes out clean.
- Cool the cakes completely in their pans before frosting so the buttercream won’t melt.
Frost and pipe the spiderweb
- Beat the frosting ingredients until smooth, tint most of it red with gel food coloring, then adjust with 2 to 3 tablespoons milk if needed for spreadable texture.
- Frost the stacked layers with the red buttercream, keeping the sides even for clean piping.
- Pipe a black spiderweb design across the top and sides, using steady pressure and letting the lines sit slightly before adding the next strand.
Notes
For the cleanest layers, only mix until the batter is just combined after adding flour and milk—overmixing can make the cake dense. Store assembled cake covered in the refrigerator up to 3 days; freeze unfrosted baked layers up to 2 months (wrap well) and thaw overnight in the fridge before frosting. For a dairy-free version, use vegan butter and a plant-based milk in both the cake and buttercream, keeping the same bake and texture cues.
