How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Peanut Butter M&M Cookie Bars?

You need 10 ingredients. The key ingredients include: 1/4 cups Unsalted Butter, Softened, 1/3 cups Brown Sugar, 1/4 cups Sugar, 1/3 cups Creamy Peanut Butter, and more.

Is Peanut Butter M&M Cookie Bars suitable as baking & desserts?

Yes, Peanut Butter M&M Cookie Bars falls under the Baking & Desserts category and is a great choice for this type of meal.

How do I store leftover Peanut Butter M&M Cookie Bars?

Store in an airtight container at room temperature for up to 3–5 days. For longer storage, freeze for up to 3 months — no need to refrigerate or reheat.

Peanut Butter M&M Cookie Bars Recipe

Name: Peanut Butter M&M Cookie Bars
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 1/4 cups Unsalted Butter, Softened; 1/3 cups Brown Sugar; 1/4 cups Sugar; 1/3 cups Creamy Peanut Butter; 1 Egg; 1 teaspoon Vanilla Extract; 1 cup All-purpose Flour; 1/2 teaspoons Baking Soda; 1/2 teaspoons Salt; 1/2 cups Peanut Butter M&Ms

Bake this irresistible Peanut Butter M&M Cookie Bars at home. Made with u00bc, Brown Sugar, u00bc and Peanut Butter. Easy step-by-step instructions incl…

This Peanut Butter M&M Cookie Bars relies on simple, everyday ingredients such as unsalted butter, softened, brown sugar, sugar and creamy peanut butter. It comes together quickly and makes 4 servings, at about 662 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

Whether you're rounding off a family dinner, bringing a treat to a gathering, or simply satisfying a sweet craving, this Peanut Butter M&M Cookie Bars delivers. Serve it warm or at room temperature, and add a scoop of ice cream or a spoonful of whipped cream for an extra-special finish.

Updated Jun 30, 2026

Serves 4 Baking & Desserts

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Preheat the oven fully and bake on the middle rack for the most even results.
Check for doneness a few minutes early — a toothpick in the center should come out with just a few moist crumbs.
Let it cool before slicing so it sets properly and holds its shape.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.
Brown sugar instead of white sugar adds a deeper, more caramel-like flavor.
A good 1:1 gluten-free flour blend works well if you need a gluten-free version.
Coconut cream is a reliable plant-based alternative to dairy cream.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Peanut Butter M&M Cookie Bars

Tips for the best results

Variations & substitutions

My Personal Notes

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