Easy Holiday M&Ms Cake Mix Cookie Bars Recipe
When you need a quick holiday treat, these M&Ms cake mix cookie bars are the answer. With just a box of yellow cake mix, a couple of eggs, some oil, and festive red and green M&Ms, you can have a whole pan of chewy, colorful dessert bars ready in no time.
They’re simple to make, easy to slice, and perfect for holiday trays or last-minute get-togethers.

WOULD YOU LIKE TO SAVE THIS FOR LATER?
Sometimes you just need a dessert that doesn’t take much effort, and that’s where these holiday M&Ms cake mix dessert bars come in.
How to Make Holiday M&Ms Cake Mix Cookie Bars
Here are the ingredients you need to make these holiday M&Ms cake mix bars, plus step by step instructions for how to make them.
Ingredients
- 15.25 oz box yellow cake mix
- 2 eggs
- ½ cup vegetable oil
- 1 cup M&Ms (red and green)

Step by Step Instructions
1. Preheat your oven to 350°F so it’s ready when your dough is mixed.
2. Lightly grease an 11×7-inch brownie pan or line it with parchment paper for easy removal.
3. In a large mixing bowl, combine the cake mix, eggs, and oil. Stir until everything is well blended and a soft dough comes together.

4. Fold in the red and green M&Ms, making sure they’re evenly distributed throughout the dough.

5. Transfer the mixture to your prepared pan. Spread it out evenly, pressing it gently into the corners and edges.

6. Bake for 25-28 minutes, or until the top is golden brown and the center is set.
7. Remove from the oven and let the cookie bars cool completely in the pan.
8. Once cooled, slice into squares or rectangles.

9. Serve and enjoy!

That’s all it takes – four ingredients and one pan. These holiday M&Ms cake mix cookie bars are easy, festive, and always a crowd-pleaser. Bring them to a Christmas party, add them to a cookie tray, or just keep a plate on the counter for everyone at home. It’s a simple recipe that makes holiday baking a little easier.
More Christmas Treats
- Christmas Haystack Cookies
- Reindeer Sugar Cookies
- Melted Snowman Chocolate Bark
- Melted Snowman Sugar Cookies
Holiday M&Ms Cake Mix Cookie Bars
Ingredients
- 15.25 oz box yellow cake mix
- 2 eggs
- ½ cup vegetable oil
- 1 cup M&Ms (red and green)
Instructions
- Preheat your oven to 350°F so it’s ready when your dough is mixed.
- Lightly grease an 11×7-inch brownie pan or line it with parchment paper for easy removal.
- In a large mixing bowl, combine the cake mix, eggs, and oil. Stir until everything is well blended and a soft dough comes together.
- Fold in the red and green M&Ms, making sure they’re evenly distributed throughout the dough.
- Transfer the mixture to your prepared pan. Spread it out evenly, pressing it gently into the corners and edges.
- Bake for 25-28 minutes, or until the top is golden brown and the center is set.
- Remove from the oven and let the cookie bars cool completely in the pan.
- Once cooled, slice into squares or rectangles.
- Serve and enjoy!


