No-Bake Monster Cookie Icebox Cake

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This No-Bake Monster Cookie Icebox Cake is layers of oatmeal cookies with a peanut butter mousse and a homemade peanut butter and oatmeal monster cookie dough. Topped off with MnMs and whipped cream.

By: Julianne Dell (via Beyondfrosting)
Original Publish: Apr 9, 2018
Last Updated: Mar 1, 2026
Prep: 30 mins
Cook: 4 hrs
Yields: 8, 8-10 slices
Finished No-Bake Monster Cookie Icebox Cake

Ingredients

Instructions

  1. Chill a metal mixing bowl in the freezer for 5-10 minutes. Prepare the whipped cream. Pour 1 ¼ cups heavy whipping cream into the chilled bowl. Use an electric mixer to beat the heavy cream on medium-high speed until the cream starts to thicken. Slowly add the powdered sugar and continue beating on high speed until stiff peaks form. Set aside.

  2. In a medium-sized mixing bowl, combine the cream cheese and peanut butter and beat until well combined.

  3. Next add the sugar and vanilla extract and beat until well combined. Fold in the prepared whipped cream and mix until smooth. Refrigerate.

  4. For the cookie dough: Soften the butter in the microwave for 10-15 seconds. Combined the softened butter with the sugars and mix until smooth.

  5. Add the peanut butter and vanilla extract and continuing mixing until well combined. Finally, add the flour, salt and quick oats and beat until a dough starts to form. Set aside.

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Chef's Notes



I suggest adding the final layer of cookie dough and MnMs to the top before serving. If the MnMs are cold or wet, the color will run.

I suggest adding the final layer of cookie dough and MnMs to the top before serving. If the MnMs are cold or wet, the color will run.

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