Rainbow cake-Part 1 🌈 This was so messy, but so worth it! Making a marbled block cake using the square frostform with Italian meringue buttercream 😍 . . . #squarecake #cakedecorating #reels #reelsinstagram #reelsinsta #cakechallenge #cakesofinstagram #bakersofinstagram #bakefromscratch #baking #frostform #italianmeringuebuttercream #rainbowcake