Shamrock St. Patricks Day Cake

Chocolate cake recipe + buttercream = the most beautiful St. Patrick’s Day Cake! Inspired by the beauty of shamrocks and all things green, this 2-layer naked Shamrock Cake is sure to be a crowd pleaser!

St. Patricks Day Cake

Shamrock Cake

This cake comes together quite easily once you have prepared. I start by making the chocolate cake recipe listed below in a 15×10 sheet pan. (Be sure to see my notes for baking times!) Allow cake to cool completely.

Create a template for your shamrock. You can freehand draw a shamrock on a piece of paper or print one off of the internet. Be sure that the size is correct! You will need to cut out 2 shamrocks from your sheet cake.

Green Buttercream for Piping

Next, I prepared the buttercream. Separate it into 4 bowls and then tint various shades of green. Start by adding a little McCormick green food coloring to one, then a little more to the next and so on. Place the buttercream in pastry bags fitted with decorating tips. I used an #2D, #9FT, #32, and the final tip didn’t have a number (the tip with the lightest green frosting in it) but is very similar to a #32. Feel free to use whatever tips you have on hand! This St. Patrick’s Day cake design is open to all interpretation.

St. Patrick's Day Naked Cake

Because it’s a 2-layer naked cake the bottom layer of frosting can be a fun “practice” layer. You can experiment with your piping and find out which techniques you like the best. Then the top layer can be covered with your favorite swirls and dollops!

Shamrock Cake

Cake Decorating

I know that cake decorating can be intimidating but this is one of those cakes that you can’t screw up. No matter how you choose to do your dollops and swirls it will be beautiful! Want proof? Let your child or friend who has never decorated cakes try it. They are so pleasantly shocked and encouraged by the ease of this design and then the stunning final product.

If you have never decorated a cake this is the cake for you. If you have decorated a 1,000 this is the cake for you. Simple design paired with amazing taste is always a winning combination!

Check out other ideas for cake decorating here.

Shamrock St. Patricks Day Cake

Now, you may be thinking “that’s a lot of frosting!” But it’s not! Truly. This is a naked cake so those fun frosting dollops are the perfect amount of frosting on each individual slice. You can always use more or less depending on your tastes!

The Perfect Chocolate Cake

The best recipe you will ever try!

  • Prep Time: 15m
  • Cook Time: 40m
  • Total Time: 55m
  • Yield: 12 slices


  • 1 3/4 c (210g) all-purpose flour
  • 2 c (400g) granulated sugar
  • 3/4 c (90g) good unsweetened cocoa powder
  • 2 tsp. baking soda
  • 1 tsp. baking powder
  • 1 tsp. kosher salt
  • 1 c (240g) buttermilk (room temperature)
  • 1/2 c (112g) vegetable oil
  • 2 extra-large eggs, at room temperature
  • 2 tsp. McCormick pure vanilla extract
  • 1 c (237g) freshly brewed hot coffee (I use decaf)


  1. Sift the flour, sugar, cocoa, baking soda, baking powder, and salt into the bowl and mix until combined.
  2. In another bowl, combine the buttermilk, oil, eggs, and vanilla.
  3. With the mixer on low speed, slowly add the wet ingredients to the dry. With mixer still on low, add the coffee and stir just to combine, scraping the bottom of the bowl with a rubber spatula. Pour the batter into two 8-inch round prepared pans and bake for 30 to 40 minutes at 350°F, until a cake tester or toothpick comes out mostly clean (not wet).
  4. Cool in the pans for 30 minutes, then turn them out onto a cooling rack and cool completely.

For this St. Patrick’s Day cake I prepared the above chocolate cake recipe in a 15×10 baking sheet.

Bake at 350°F for 20-26 minutes. The center should no longer appear wet and if you press your finger into the cake it should spring back.

I used this buttercream recipe.

For a fun variation try making your chocolate with Stout beer instead of coffee! You can also use hot water in place of the coffee.






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That is beautiful!