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Oatmeal Chocolate Chip Cookie Cake

5 from 10 votes
Oatmeal Chocolate Chip Cookie Cake.
Tender and hearty oatmeal chocolate chip cake layers, covered in a cinnamon chocolate chip buttercream.

Ingredients

FOR THE CAKE

  • 2 1/2 cups (590 g) water
  • 2 cup (180 g) uncooked rolled oats
  • 1 cup (226 g) butter
  • 3/4 cup (150 g) granulated sugar
  • 1 cup (220 g) brown sugar packed
  • 2 teaspoons (8.4 g) vanilla
  • 4 eggs room temperature
  • 1 teaspoon (5.6 g) kosher salt
  • 2 teaspoon (8 g) baking soda
  • 2 teaspoon (5.2 g) cinnamon
  • 1 1/2 cups (180 g) all purpose flour
  • 1 1/2 cups Kodiak Cakes Cinnamon Oat Pancake Mix*
  • 1 cup (150 g) mini chocolate chips

FOR THE BUTTERCREAM

  • 3 cups (678 g) unsalted butter slightly chilled
  • 8 cups (1000 g) powdered sugar measured and then sifted 
  • 2 teaspoons (5.2 g) cinnamon
  • 1 teaspoon (4.2 g) vanilla extract
  • 4 tablespoons (57.75 g) heavy whipping cream
  • 1/2 - 1 cup (75 - 150 g) mini chocolate chips*
  • *This buttercream recipe makes enough to fill and cover your cake. If you want to add additional piping, you’ll want to make an extra 1/2 batch.

FOR THE GANACHE

  • 1 cup (150 g) dark chocolate chips
  • 3/4 cup (173.25 g) heavy whipping cream
US Customary - Metric

Instructions

FOR THE CAKE

  • Preheat your oven to 350 degrees F. Spray three 8-inch or four 6-inch round cake pans with nonstick cooking spray, line the bottoms with parchment paper and spray again. Set aside.
  • In a medium sized pot bring the water to a boil. Add in the oats, stir and remove the pot from the heat. Cover the pot and allow the oats to soak for 20 minutes, until all the water is absorbed. Let the oatmeal cool completely before adding it to the cake batter.
  • In a medium sized mixing bowl, combine the baking soda, salt, cinnamon, flour and Kodiak mix (if using). Whisk together. Set aside.
  • In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and sugars together on medium speed for 2 minutes until light and fluffy. Add in the vanilla and the eggs and mix until combined, scraping the sides of the bowl as necessary.
  • Turn the mixer to low and add in the cooled cooked oats and the flour, mixing until just combined. (If you're not using the Kodiak mix, this is when you can add in the extra cinnamon and uncooked oats).
  • Toss the mini chocolate chips in a tablespoon of flour and then stir into the batter.
  • Spread the cake batter into the prepared pans, about 20 ounces of batter in each 8-inch or 15 ounces in each 6-inch pan, and bake for 20-22 minutes or until the cake is set in the center and a toothpick comes out with just a few moist crumbs on it. 
  • Allow the cake to cool in the pans for about 5 minutes and then invert onto wire racks to cool completely. Level the cakes.
  • If you're not using the cake layers right away, wrap each layer in plastic wrap. You can freeze them up to a week or up to a month if you also wrap them in foil.

FOR THE BUTTERCREAM

  • In the bowl of a stand mixer fitted with the paddle attachment, beat the butter until light and fluffy, about two minutes.
  • With the mixer on low speed, gradually add the powdered sugar, followed by the cinnamon, vanilla and heavy whipping cream. Turn the mixer to medium-high and beat the frosting for about 5 minutes. This will lighten the texture and color a bit. 
  • Stir in 1 cup of mini chocolate chips, if using for all of the frosting. If you're only using the mini chocolate chips in between the cake layers, remove two cups of frosting from the bowl and mix in 1/2 cup mini chocolate chips to the two cups of frosting.

FOR THE GANACHE

  • Heat the heavy whipping cream and pour over the chocolate chips. Let the cream warm up the chocolate chips for about 5 minutes and then stir until smooth and silky. 

ASSEMBLY

  • On a cake board, spread a small dollop of frosting to hold the cake in place. Place your first of the three cake layers on the board, crumb side up.
  • Spread 1 cup of frosting (with chocolate chips) on the cake layer. Get eye level with the cake to make sure the layer of frosting is applied evenly.
  • Repeat step 2 for the next cake layer and layer of frosting. For the final cake layer, place it top side down, so the smoothest side of the cake (the bottom) is facing up.
  • Cover the entire cake with a thin layer of frosting. Chill the cake for 10 minutes to set the crumb coat and lock in the crumbs. 
  • Once the crumb coat is set, frost the cake with the remaining frosting.

Notes

  1. As mentioned above, you can make this cake without the Kodiak Cinnamon Oat mix - just replace the Kodiak mix with the same amount of all-purpose flour. You'll also want to add another teaspoon of cinnamon and 1/4 uncooked oats.
  2. This recipe for frosting makes a little more than what I usually give you. I noticed that my normal amount of frosting didn't quite give me enough to cover the entire cake since I added chocolate chips to it. The chocolate chips make the frosting a little thicker and to cover the entire cake and fill it, you'll need three cups of butter and eight cups of powdered sugar. However, if you don't want chocolate chips in your outter coat of frosting, reduce the butter to two cups, powdered sugar to six cups. The rest of the ingredients can stay the same.
  3. If you don't use chocolate chips in the outter coat of frosting, you'll only need 1/2 cups mini chocolate chips to add to two cups of frosting for the filling.