Cake Mix Cookie Bars

4.60 from 5 votes
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Cake mix cookie bars are the ultimate semi-homemade dessert. These lazy cookie bars are filled with colorful chocolate candy and are always a winner with the kids.

Cake mixes can be used in so many different ways than the recipe on the box. I love using it for cookies like these lemon cookies and strawberry cookies

stacked cookie bars

Have you ever been invited to a party or gathering last minute and need something quick to make and bring over? Or have your kids shown up with a group of starving friends ready for a snack?

These cookie bars are just the thing to make for these type of situations. Four ingredients, about 30 minutes and you have a treat that everyone will be asking for the recipe. 

Why this works

  • Using cake mix makes this recipe fast to whip up.
  • Only need 4 ingredients. 
  • Perfect for a last minute dessert.
  • Delicious, chewy texture with a slight candy coated crunch. 

bag of m&m's, eggs, butter, cake mix

Ingredients needed

Yellow cake mix – The base of the cookie bars.

Butter – Adds rich flavor.


M&M’s – Add fun color and of course chocolate goodness.

How to make cookie bars with cake mix

Scroll to the bottom for full printable recipe, ingredients and video.

  • Mix: Put cake mix, melted butter and eggs into a large bowl. Mix until combined.
  • Stir: Stir candy in with the batter.
  • Spread: Spread batter evenly in a 9 x 13 ban lined with parchment paper or foil. The batter is very thick so use a spatula or your hands to get the batter pressed down and spread. 
  • Bake: Bake cookie bars for about 20 – 25 minutes or until starting to turn golden brown. 
  • Cool: Make sure to let the bars cool before cutting. 

candy in a bowl with batter

How to store

These will stay good at room temperature in an airtight container. They will last about one week, but mine always get eaten way before that. 

To freeze, make sure they completely cool. I like to cut mine into squares and then place them on a baking sheet in the freezer. Once they have frozen, place the squares in a freezer safe container. Thaw in the refrigerator.


The awesome thing about these cookie bars is that you can use most any candy. I love the colorful M&M’s but here are some other delicious options:

  • Chocolate Chips
  • White Chocolate Chips
  • Butterscotch Chips
  • Chopped Heath Bar
  • Reeces Pieces (Love this one)
  • Butterfinger

Can I use a different cake mix?

Yes, you can use white, chocolate, even red velvet. I prefer the rich vanilla flavor the yellow mix gives these bars. 

Cake Mix Cookie Bars on a plate

More delicious cookie recipes

***If you made this recipe, please be sure to leave a comment and rating below. 

cookie bars on a plate
4.60 from 5 votes

Cake Mix Cookie Bars

By Heather
These cake mix cookie bars can be made with just a few ingredients.
Prep: 5 minutes
Cook: 25 minutes
Total: 30 minutes
Servings: 24 squares


  • 1 (15.25 oz) box yellow cake mix
  • 2 eggs
  • 1/2 cup butter, melted
  • 2 cups M&M's


  • Preheat oven to 350 degrees F. Line a 9 x 13 inch baking pan with parchment paper and spray with non-stick spray.
  • Pour cake mix, eggs and butter in a large bowl. Stir until combined.
  • Stir in M&M's.
  • Spread batter in prepared baking pan. Use a spatula or hands to press down.
  • Bake for 20-25 minutes. The edges should start to turn golden brown. Cool before cutting.



Calories: 126kcal | Carbohydrates: 12g | Protein: 1g | Fat: 8g | Saturated Fat: 5g | Cholesterol: 26mg | Sodium: 51mg | Potassium: 5mg | Fiber: 1g | Sugar: 11g | Vitamin A: 177IU | Vitamin C: 1mg | Calcium: 23mg | Iron: 1mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Additional Info

Course: Dessert
Cuisine: American
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Recipe Rating


  1. 5 stars
    These brownies were perfect; almost as good as using regular ingredients but faster and less time gathering ingredients: raising four boys leaves me little time to spend looking for ingredients. However, I always have a box of cake mix. Now two of my boys want to try different cake mixes and experiment. I call that a double success recipe. Thank you.

    1. I’m so happy you are enjoying them! With four boys I am sure you are so busy!! Thank you for the comment!

  2. 3 stars
    I followed the recipe to a T. Perfect conditions, turned out as just cake. Fluffy. Airy. Not dense or chewy like anything resembling a cookie. Tasty, but not at all what I was looking for. Would’ve just made regular cake tbh.