Rainbow Fudge Cookie Bars

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Chewy, fudgy chocolate chip cookie bars topped with chocolate fudge and rainbow M&M’S. Only 4 ingredients needed to make Rainbow Fudge Cookie Bars!

Love easy dessert recipes? These Oreo Brownies are one bowl, from scratch, and packed with flavor! Or give this delicious Ricotta Cookie recipe a try.

Chocolate chip cookie bars with fudge and rainbow candies.

Sometimes you don’t want to run all over the store tracking down the ingredients you need to make a delicious dessert.

When you don’t have the time or the energy for a complicated cookie bar recipe, these easy four ingredient fudge cookie bars are the solution! Not to be confused with these 3 ingredient peanut butter cookies!

Starting with a roll of cookie dough, you can make a layered cookie bar that’s full of chocolate and topped with a crunchy layer of M&Ms.

The colorful candies add a rainbow splash to these cookie bars that’s just right for a birthday party!

Ingredient Notes

Here’s all you need to make fudge cookie bars:

  • Cookie dough – Use a 30 ounce package of your favorite chilled chocolate chip cookie dough.
  • Sweetened condensed milk
  • Chocolate chips – I used milk chocolate, but semi sweet would work too for a darker chocolate flavor.
  • Mini M&Ms – Use the package of baking M&Ms for best results or swap full sized M&Ms if preferred.
Rainbow fudgy chocolate chip bars on a wooden cutting board.

First, bake the cookie bars.

You can make the fudge layer for these bars using your microwave! I heat the condensed milk and the chocolate morsels together in the microwave for 30 second increments.

Stir between each interval and repeat until the fudge mixture is smooth and all the chocolate is fully melted. For me, this takes about 90 – 120 seconds total of microwave time.

Then, you pour the fudge layer over a baked layer of cookie dough, top with M&Ms and let the bars chill in the fridge until the fudge layer is set. This takes at least 2 hours but you could also make them in advance to let the fudge chill over night.

Slice the bars and store in an airtight container until ready to eat.

Recipe FAQs

Can this be made with homemade cookie dough?

Sure thing! Make sure to make the equivalent of 30 ounces of dough so you have enough for the bottom layer of these bars.

What sized pan do I need?

I made mine in a 15 x 10 x 1 inch baking sheet.

Do these need to be kept in the refrigerator?

No. Once the fudge is set they keep just fine at room temperature!

Rainbow Fudge Cookie Bars recipe with 4 simple ingredients! Soft, chewy cookies with a layer of fudge and candy!

A chewy layer of chocolate chip cookies, a rich layer of fudge and colorful M&Ms make these Rainbow Fudge Cookie Bars so delightful.

More Birthday Desserts

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Rainbow Fudge Cookie Bars

5 from 2 votes
By: Aimee
These Rainbow Fudge Cookie Bars are the perfect birthday treat. Chocolate chip cookie dough topped with fudge and M&M's candies!
Prep Time: 10 minutes
Cook Time: 15 minutes
Total Time: 25 minutes
Servings: 48 bars


  • 1 package 30 ounce refrigerated Chocolate Chip Cookie Dough
  • 1 can 14 ounce sweetened condensed milk
  • 1 package 11 ounce milk chocolate morsels
  • 1 package 12 ounce m&m minis (for baking)
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  • Press cookie dough into a lightly greased 15x10x1-inch baking sheet. Bake in a 350 degree oven for 15 minutes. Remove and cool slightly.
  • In a microwave safe bowl, combine sweetened condensed milk with chocolate morsels. Heat for 30 seconds, stir, and heat an additional 30 seconds. Stir until smooth and creamy. Spread evenly over baked cookie bars.
  • Sprinkle immediately with m&m minis. You can use regular sized candies if you prefer.
  • Refrigerate until fudge layer sets up (about 2 hours, or overnight). Store in airtight container. ENJOY


  • Can I use homemade cookie dough? Sure thing! Make sure to make the equivalent of 30 ounces of dough so you have enough for the bottom layer of these bars.
  • I made mine in a 15 x 10 x 1 inch baking sheet.
  • Once the fudge is set they keep just fine at room temperature!


Serving: 1, Calories: 6kcal, Carbohydrates: 1g, Sodium: 3mg, Sugar: 1g
Course: Cookies
Cuisine: American
Did you make this recipe?Mention @shugarysweets or tag #shugarysweets!
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About Aimee

Aimee is a dessert lover (specifically rice krispie treats), workout enthusiast, self-taught foodie, and recipe creator.

Learn more about Aimee.

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Posted on September 11, 2014

Comments & Reviews

  1. Hi, I found this on FoodGawker and was hoping I could get your permission to post the recipe on my instagram recipe page (@foodie_recipes) as it looks delicious! I will tag you in the photo and put your website address on the post! Hope this is okay, thanks 🙂 x

  2. I don’t have a problem with refrigerated cookie dough – these look fantastic! Happy birthday to your husband!

  3. I won’t judge you for using refrigerated cookie dough if you ignore my use of cake mixes and cool whip… I love the scattering of mini M&M’s on the top and the fudgy middle layer will go over well here:) Don’t feel bad; my husband would’ve picked a store-bought angel food cake with a tub of frosting smeared on it. His mom’s creation, not mine!

  4. Love these bars, the colors, so bright and cheery and perfect! Pinned.

    Birthdays. As a dessert blogger, you’d think that when a family member has a bday I’d be the first one there with a big gorgeous cake? No. Let’s open my freezer and see what frozen dough balls I can pop in the oven and bake. LOL And I was already starting with pumpkin recipes a couple months ago too and Xmas stuff…red velvet is on my agenda next week. LOL

  5. I love that these are so simple, yet fabulous looking!!! That 2 ingredient microwave fudge is a favorite here too! Happy birthday Michael! And enjoy that ice cream…that would be my hubby’s choice too! LOL!

  6. Do not read into it at all! I have the same problem. I think my family is just spoiled with the homemade stuff and they yearn for processed, packaged food.
    I’ll eat this any day! Nothing beats fudge on cookie bars, especially with M & Ms.

  7. Happy Birthday to your hubby! And mine would always pick oreo ice cream over the fanciest cake, so I say, follow the bday boy’s wishes!

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