These M&M Cake Mix Brownies are rich, chewy, and packed with chocolate in every bite. Made in a simple 9x9 pan, they're the kind of dessert that disappears fast at parties and potlucks.
I love recipes like this when I need something dependable and indulgent without a lot of fuss. Using a boxed cake mix keeps things easy, but the buttery brownie texture makes them taste like you spent far more time in the kitchen.
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Why You'll Love Cake Mix Brownies
Deep chocolate flavor from Devil's food cake mix and semi-sweet chocolate chips.
Soft centers with set edges for that classic brownie bar texture.
Crowd favorite that's easy to transport and serve for gatherings.
Key Ingredients for Easy Brownie Bars
See the recipe card below for a full list of ingredients and instructions.
- Devil's Food Cake Mix: creates a rich chocolate base with minimal effort.
- Salted butter: adds flavor and gives the brownies their chewy texture.
- Eggs: help bind the batter and keep the centers soft.
- Chocolate chips: melt into the brownies for extra chocolate pockets.
- Mini M&M's add crunch, color, and a fun candy finish.
Ingredient Substitutions
- Use unsalted butter and add a pinch of salt if that's what you have on hand.
- Swap milk chocolate chips for semi-sweet if you prefer a sweeter brownie.
- Replace mini M&M's with regular M&M's, roughly chopped.
Variations on Cake Mix Brownies with Chocolate
- Nutty crunch: stir in chopped walnuts or pecans for added texture.
- Cake mix swap: use any chocolate cake mix you like, it will change the sweetness and intensity slightly, so choose one that fits your crowd's taste.
- Seasonal swap: use holiday-colored M&M's to match the occasion.
Tips for the Best Fudgy Brownies
- Do not overbake - the center should look slightly underdone with set edges when you pull them out.
- Line the pan with parchment paper for easy lifting and clean slices.
- Cool completely before cutting to keep the bars neat and intact.
How to Store
Store brownies in an airtight container at room temperature for up to 3-5 days or in the refrigerator for up to 1 week. For a warm treat, reheat individual squares in the microwave for 10-15 seconds.
Serving Suggestions for Cake Mix Brownies
Serve these brownies slightly warm with a scoop of vanilla ice cream, or add them to a dessert table alongside other easy party sweets. They pair especially well with coffee or milk!
More Dessert Recipes You'll Love
OIf you love the convenience of using a boxed mix, you'll definitely enjoy these soft and citrusy Lemon Cake Mix Cookies. For more chocolate fixes, try my Sour Cream Chocolate Cake, or the retro, crowd-pleasing Jello Poke Cake, which both use a cake mix base for a stress-free dessert.
If you whip up a batch of these fudgy brownies, please leave a ⭐⭐⭐⭐⭐ rating and comment below. I love hearing how your bakes turn out!
I love seeing your creations, so don't forget to tag me on Instagram @grumpyshoneybunch so I can see your photos!
📖 Recipe
M&M Cake Mix Brownies
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Ingredients
- 15.5 ounces Duncan Hines Devil's Food cake mix
- ½ cup salted butter melted
- 2 large eggs
- 1 cup semi-sweet chocolate chips
- 1 cup mini M&M candies divided
Instructions
- Preheat the oven to 350 degrees F. Butter and line a 9x9 baking dish with parchment paper. Set aside.
- In a large mixing bowl, add the cake mix, pour in the melted butter, and add eggs. Mix with an electric hand mixer until all ingredients are combined.
- Using a wooden spoon or large rubber spatula, stir in the chocolate chips and half of the M&M candies until well combined.
- Spread the batter evenly into the prepared baking dish and sprinkle the remaining of the M&M candies on top.
- Bake for 23-25 minutes, until the edges are set, and the center is soft.
- Remove from oven and cool completely in the pan.
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