These Christmas Cake Mix Bars are simple to make and one of my favorite holiday treats. With a box of cake mix and five more ingredients, you can mix, bake, and enjoy a festive dessert in under an hour.

Cake mix desserts are a go-to when you want something delicious with minimal effort. For this recipe I used a yellow cake mix and added chocolate chips and Christmas M&Ms for color and texture, but you can easily substitute other mix flavors or mix-ins to suit your taste.
How to make Christmas Cake Mix Bars:
Step one: Preheat the oven to 350°F (175°C). Prepare a 9×13-inch baking dish with nonstick spray or line it with parchment paper, then set it aside.
Step two: In a large bowl, combine the cake mix, eggs, melted butter, and vanilla extract. Stir until the batter comes together, then fold in 1/2 cup of chocolate chips and 1/2 cup of Christmas M&Ms.
- Tip: Try different cake mix flavors such as chocolate or red velvet for a new twist.

Step three: Spread the batter evenly into the prepared 9×13 dish. Sprinkle the remaining 1 cup of chocolate chips and M&Ms across the top for a festive finish.
Step four: Bake for 20–25 minutes, or until the edges are set and a toothpick inserted into the center comes out with a few moist crumbs. Allow the bars to cool completely in the pan before slicing into squares and serving.
Christmas Dessert:
If you enjoy these bars, here are a few other favorite holiday treats to try when planning your cookie and dessert trays:
- Chocolate Christmas Sprinkle Cookies
- Peppermint Bark
- Hot Chocolate Cookie Cups
- Chocolate Christmas Fudge

If you try this recipe, I’d love to hear how it turned out—leave a comment below. You can also connect on social media and follow along for more recipes and ideas.
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Christmas Cake Mix Bars
Jennie Duncan
15 mins
25 mins
40 mins
12 servings
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Ingredients
- 15.25 oz yellow cake mix, 1 box
- 2 large eggs
- 1/2 cup butter, (melted)
- 1 teaspoon vanilla extract
- 1/2 cup chocolate chips
- 1 cup Christmas M&Ms
Instructions
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Preheat oven to 350°F (175°C). Prepare a 9×13-inch casserole dish with nonstick cooking spray or parchment and set aside.
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Mix together the cake mix, eggs, melted butter, and vanilla extract until combined. Fold in 1/2 cup of chocolate chips and 1/2 cup of M&Ms.
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Spread the batter evenly into the prepared dish. Top with the remaining chocolate chips and M&Ms.
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Bake 20–25 minutes, then let cool completely. Slice into squares and serve.
Notes
- Tip: Swap the cake mix flavor or add nuts, white chocolate chips, or festive sprinkles to customize these bars.
Nutrition
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Carbohydrates: 47g
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Protein: 4g
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