I love all of the different things you can do with a basic yellow cake mix. You can easily make cookie bars with cake mix. With just a few ingredients you can have a delicious cake or ooey gooey cookies, like these Chocolate-Peanut Butter Cake Mix Cookie Bars. This cake mix cookie bar recipe is pure decadence and incredibly simple to make!
Seriously, YUM.
I’m all about easy recipes with few ingredients. This Chocolate-Peanut Butter Cake Mix Cookie Bars recipe is one of my absolute favorites. If you LOVE that combination of peanut butter and chocolate, you’ll definitely want to check out these recipes for Decadent Dark Chocolate Brownies with Fluffy Peanut Butter Frosting, No Bake Chocolate Peanut Butter Mini Cakes and Chocolate Peanut Butter Banana Breakfast Shakes.
See how to make these amazing cookie bars:
Check out some of my other favorite cake mix recipes:
Strawberry Chocolate Chip Cake Mix Cookies
Rainbow Sprinkle White Cake Mix Cookies
Triple Chocolate Cake Mix Cookies
Ridiculously Easy 3 Ingredient Potluck Cake
Also, take a look at these yummy dessert and cookie bar recipes:
Lemon Blueberry Cheesecake Bars
Not Your Average Lemon Strawberry Bars
Chocolate-Peanut Butter Cake Mix Cookie Bars
Ingredients:
1 (18.25) package plain yellow cake mix
1/2 cup butter, melted
1 cup creamy peanut butter (I used crunchy- it was amazing)
2 eggs
1 (12 oz) package semi-sweet chocolate chips
1 (14 ounce) can sweetened condensed milk
2 Tablespoons butter
2 teaspoons vanilla
Directions:
1. Preheat oven to 325 degrees. Set aside an ungreased 9X13 inch metal pan.
2. Stir and combine cake mix, melted butter, peanut butter, and eggs in a large bowl using an electric mixer or a wooden spoon. The batter will be thick. Press this into the pan, reserving 1 1/2 cup of the mixture to crumble on top.
3. In a small pot, melt chocolate chips, sweetened condensed milk, and butter. Remove from heat and stir in the vanilla.
4. Spread chocolate mixture over the cookie crust in the pan, and then crumble the 1 1/2 cups of reserved cake mixture on top evenly.
5. Bake for 20-25 minutes. Cool completely before cutting into bars.
These cookie bars are amazing when eaten warm, but are just as good cooled. Serve with a tall glass of milk, and enjoy. You know you want one!
Printable recipe at the bottom of this post!
Want more chocolate goodness? Check out this recipe for Texas Turtle Sheet Cake! It is divine.
How to Store Leftover Cake Mix Cookie Bars
These cookie bars will stay soft and chewy, even after they cool. Just make sure that you store them cooled in an airtight container!

Chocolate-Peanut Butter Cake Mix Cookie Bars
Ingredients
- 1 18.25 package plain yellow cake mix
- 1/2 cup butter melted
- 1 cup creamy peanut butter I used crunchy- it was amazing
- 2 eggs
- 1 12 oz package semi-sweet chocolate chips
- 1 14 ounce can sweetened condensed milk
- 2 Tablespoons butter
- 2 teaspoons vanilla
Instructions
- 1. Preheat oven to 325 degrees. Set aside an ungreased 9X13 inch metal pan.
- 2. Stir and combine cake mix, melted butter, peanut butter, and eggs in a large bowl using an electric mixer or a wooden spoon. The batter will be thick. Press this into the pan, reserving 1 1/2 cup of the mixture to crumble on top.
- 3. In a small pot, melt chocolate chips, sweetened condensed milk, and butter. Remove from heat and stir in the vanilla.
- 4. Spread chocolate mixture over the cookie crust in the pan, and then crumble the 1 1/2 cups of reserved cake mixture on top evenly.
- 5. Bake for 20-25 minutes. Cool completely before cutting into bars.
- These cookie bars are amazing when eaten warm, but are just as good cooled. Serve with a tall glass of milk, and enjoy. You know you want one!
Nutrition
I made these after seeing a recipe for Girl Scout Cookie Tagalong Cake Bars over at Kevin and Amanda. My version is a little different, because I don’t have any Girls Scout cookies.
Need some quick, easy and budget friendly dinner ideas? Try these!
Easy Pulled Chicken in Red Sauce
Tangy Beef and Noodle Casserole
Baked Spaghetti Freezer-Friendly Recipe
Classic Baked Penne Pasta with Ricotta Recipe
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I’m making them now. The chocolate filling is to die for. This is my new go to recipe. So easy and I can keep ingredients on hand.
I’m not rating this. I had no idea this would have so much chocolate I should’ve read the recipe better before buying and starting to make this. I think the chocolate layer could be reduced by half. For sure not a diabetic friendly cookie bar lol