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Rainbow layered Leprechaun Hat St. Patrick's Day Cake
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Leprechaun Hat Rainbow Cake

This easy to make Leprechaun Hat is the perfect St. Patrick's Day cake. This rainbow cake is 6 layer cake will look amazing when you cut it open to serve to your guests.
Prep Time15 mins
Cook Time25 mins
Decorating time30 mins
Total Time1 hr 10 mins
Course: Cake
Cuisine: American
Keyword: St. patrick's Day cake
Servings: 8
Author: Jill


  • 3 boxes French vanilla cake mix
  • 3 C cold whole milk
  • 9 large eggs
  • 1 1/2 C unsalted butter softened (3 sticks)
  • Red, Orange, Yellow, Green, Blue and Purple food coloring
  • Pam baking spray

Vanilla Frosting

  • 3 C unsalted butter softened
  • 8 C powdered sugar
  • 3 tsp pure vanilla extract
  • 5 tbsp heavy whipping cream
  • Kelly Green Gel Food Coloring
  • Black Gel Food Coloring
  • Gold Gel Food Coloring


  • Preheat oven to 350 degrees and spray the cake pans with baking spray
  • In a large mixing bowl, mix together cake mix, milk, eggs, and butter until combined and smooth
  • Split the batter evenly between the 6 mixing bowls
  • Add in a few drops of color into their own bowls
  • Mix until colors are combined
  • Pour the red batter into one cake pan
  • Pour the orange batter into the second cake pan
  • Pour the yellow batter into the third cake pan
  • Repeat steps with remaining colored batter and cake pans
  • Bake the pans in the preheated oven for 21-25 minutes or until a tooth pick comes out clean
  • Allow cakes to cool completely on the counters
  • Using the cake leveler, cut the domes off of the cakes to create even slices

Frosting directions

  • Using a standing mixer, beat together all ingredients until smooth and stiff peaks form, about 5-7 minutes

Directions on putting the cake together

  • Place the purple cake layer onto the cake board
  • Scoop about 1 C of frosting onto the cake layer and spread evenly
  • Place the blue cake layer on top of the frosting
  • Scoop 1 C of frosting onto the blue layer and spread evenly
  • Place the green cake layer on top of the second layer or frosting
  • Scoop 1 C of frosting onto the green layer and spread evenly
  • Repeat steps with the Yellow, Orange and Red layer. Make sure you put
  • the cake layers in the order of Purple, Blue, Green, Yellow, Orange and Red
  • Scoop 2 C of the frosting into a medium bowl and mix in until combined several drops of black food coloring
  • Scoop the black frosting into the piping bag fitted with a medium star tip
  • Scoop 1 C of the frosting into a small bowl and mix until combined several drops of gold gel food coloring until combined
  • Scoop the gold frosting into the piping bag fitting with a small star tip
  • Using the remaining frosting in the mixing bowl, mix in a few drops of the kelly green food coloring
  • Scoop all that frosting into the large piping bag fitted with the large star tip

Decorating directions

  • Place the cake onto the serving board
  • Using the green frosting, pipe an edging around the bottom of the cake board to create the bottom part of the hat
  • Using the black frosting, pipe the belt buckle all around the hat
  • Using the Green frosting again, pipe dollops of green frosting all over the cake until completely covered
  • Using the Gold frosting, pipe the buckle in the front and center of the black belt on the cake
  • Place back into the fridge overnight to get a clean cut
  • Enjoy