M&M Cookie Bars

soft, chewy cookie dough packed with colorful M&Ms, all baked in one pan and sliced into thick, irresistible bars. These aren’t just cookies — they’re the perfect combination of chewy centers, golden edges, and melty chocolate, wrapped in a pop of color that brings joy to every bite.

Whether you’re prepping for a birthday party, bake sale, or just a cozy night in, this guide will show you how to make M&M cookie bars easily — even if you’re a beginner baker. Let’s dive in.

Why You’ll Love Making M&M Cookie Bars

Here’s why these bars are about to become your go-to dessert:

• ✅ Quick & easy: No rolling, no scooping. Spread and bake in one pan.
• ✅ Perfect for a crowd: M&Ms make them festive and fun for any occasion.
• ✅ Customizable: Easily tweak with your favorite add-ins and flavors.
• ✅ Thick & chewy: Hits the sweet spot between soft cookie and blondie.
• ✅ Make-ahead friendly: Stays delicious for days and freezes beautifully.

Ingredients You’ll Need for the Best M&M Cookie Bars

Chances are, most of these pantry staples are already in your kitchen.

Ingredients Table

Ingredient	Quantity	Notes/Substitutes
All-purpose flour	2 ¼ cups	Spooned & leveled
Baking soda	½ tsp
Salt	½ tsp
Unsalted butter	1 cup (2 sticks)	Softened
Brown sugar	1 cup	Packed
Granulated sugar	½ cup
Large eggs	2	Room temperature
Vanilla extract	2 tsp
M&Ms (regular or mini)	1 ½ cups	Plus extra for topping
Semi-sweet chocolate chips	½ cup	Optional but highly recommended

Step-by-Step Guide: How to Make M&M Cookie Bars Easily

Follow these straightforward steps, and you’ll have bakery-quality bars ready in no time.

1. Preheat and Prep Your Pan

• Preheat your oven to 350°F (175°C).
• Line a 9×13-inch baking pan with parchment paper or lightly grease it.

2. Mix Dry Ingredients

• In a medium bowl, whisk together flour, baking soda, and salt.
• Set aside.

3. Cream Butter and Sugars

• In a large mixing bowl, beat the softened butter, brown sugar, and granulated sugar until light and fluffy (about 2–3 minutes).
• For effortless, lump-free creaming, use a stand mixer , which handles the heavy mixing with ease .
• Add eggs one at a time, mixing well after each addition.
• Stir in vanilla extract.

4. Combine Wet and Dry

• Gradually add the dry ingredients to the wet mixture.
• Mix just until combined. Don’t overmix — it’s fine if a few streaks of flour remain.

5. Fold in M&Ms and Chocolate Chips

• Gently fold in 1½ cups of M&Ms and the chocolate chips (if using).
• Reserve a handful of M&Ms to press on top just before baking.

6. Spread and Bake

• Spread the dough evenly into your prepared baking pan.
• Press the reserved M&Ms onto the surface of the dough.
• Bake for 25–30 minutes, or until golden brown and the center is just set.

7. Cool and Slice

• Allow the bars to cool completely in the pan on a wire rack.
• Once cool, slice into squares or rectangles using a sharp knife.

Pro Tips for Perfect M&M Cookie Bars Every Time

Let’s ensure your bars turn out bakery-perfect on the first try:

• ✅ Don’t overbake: Remove from the oven as soon as the center sets — the bars continue cooking in the pan.
• ✅ Room temperature ingredients: Ensure butter and eggs aren’t cold; it helps them mix smoothly.
• ✅ Use a stand mixer: For even mixing and fluffy creaming, a stand mixer like the Aucma Stand Mixer is a game-changer .
• ✅ Chill dough (optional): For thicker bars, chill the dough in the pan for 20–30 minutes before baking.
• ✅ Mix up the add-ins: Swap or combine M&Ms with white chocolate chips, peanut butter chips, or festive sprinkles.

Creative M&M Cookie Bar Variations to Try

Once you master the classic version, here’s how you can easily remix them:

• 🎉 Peanut Butter M&M Bars: Add ½ cup creamy peanut butter to the wet ingredients and use peanut M&Ms.
• 🍪 Monster Cookie Bars: Stir in ½ cup oats, ½ cup chopped nuts, and extra chocolate chips.
• 🎄 Holiday Cookie Bars: Use seasonal M&M colors (red/green for Christmas, pastels for Easter).
• 🍯 Brown Butter Bars: Brown the butter before mixing for a rich, nutty flavor boost.

FAQ: Everything You Need to Know About M&M Cookie Bars

How do I store M&M cookie bars?

Store your bars in an airtight container at room temperature for up to 5 days. They stay soft and chewy!

Can I freeze M&M cookie bars?

Yes! Cool the bars completely, then wrap them tightly in plastic wrap and foil. Freeze for up to 3 months. Thaw at room temperature before serving.

What pan size works best for M&M cookie bars?

A 9×13-inch baking pan works perfectly for thick, chewy bars. You can also halve the recipe and use an 8×8-inch pan (adjust baking time slightly).

Do I have to chill the dough?

No, chilling isn’t necessary, but it can result in thicker, chewier bars if you have the time.

What kind of M&Ms should I use?

Classic milk chocolate M&Ms work great, but feel free to try minis, peanut M&Ms, or festive holiday blends.

Your New Favorite Dessert Is Ready

Now you know exactly how to make M&M cookie bars easily, and you’re just a pan away from a colorful, chewy masterpiece. Whether you’re making them for a party, bake sale, or just to treat yourself, these bars are guaranteed to make people smile.

Remember — using a stand mixer can make creaming butter and sugar effortless, helping your dough come together perfectly every time.

Your turn: Gather your ingredients, preheat that oven, and bake a batch of M&M cookie bars that disappear faster than you can say “just one more!” 🍪