The first time I made these for my wife, she called her mother. Not because something went wrong — because something went very, very right. Thick and Chewy M&M Cookies are the kind of cookie recipes home run that looks like you’ve been baking for decades even if you’ve only made them once. The key isn’t the M&Ms — it’s the dough around them. Get the dough right and the colorful candy does the rest of the visual work.
What separates a good M&M cookie from a great one is thickness and chew. Too thin and they’re just crispy candy vehicles. Too thick and they’re raw in the middle. The target is a cookie that’s nearly an inch tall, golden and set on the outside, but genuinely chewy and soft through the entire center. That combination requires cold dough, the right fat ratio, and restraint in baking time. Pull them out when they still look slightly underdone. Always.
These are a natural match for double chocolate cookies on any dessert platter, and the chocolate-adjacent family extends to brown butter chocolate chip cookies if you’re building a full cookie spread. Make all three. Leave nothing behind.
Why These Thick and Chewy M&M Cookies Work
- Bread flour option — a partial substitution adds protein that creates chewier texture
- Cold dough — prevents spreading during baking, keeping cookies thick
- Extra M&Ms pressed on top — ensures visual color distribution on every finished cookie
- Cornstarch addition — keeps centers soft and prevents cookies from becoming crispy throughout
- High brown sugar — moisture retention from molasses maintains chew for days
Ingredients
The Dough
- 2 1/4 cups (285g) all-purpose flour
- 1 teaspoon cornstarch
- 1 teaspoon baking soda
- 1/2 teaspoon fine salt
- 3/4 cup (170g) unsalted butter, room temperature
- 3/4 cup (150g) light brown sugar, packed
- 1/2 cup (100g) granulated sugar
- 2 large eggs, room temperature
- 2 teaspoons pure vanilla extract
The M&Ms
- 1 1/2 cups plain M&M candies, divided — reserve 1/2 cup for pressing on top after baking
How to Make Thick and Chewy M&M Cookies
Step 1: Make the Dough
Beat butter on medium speed until smooth, about 1 minute. Add both sugars and beat on medium-high for 2-3 minutes until pale and fluffy. Add eggs one at a time, then vanilla. Beat until fully combined. Reduce to low and add flour, cornstarch, baking soda, and salt. Mix until just combined. Fold in 1 cup of M&Ms with a spatula, reserving the remaining 1/2 cup for finishing.
Step 2: Chill the Dough (Required)
Cover the bowl tightly and refrigerate for a minimum of 1 hour, ideally 24 hours. This step is the difference between thick cookies and flat ones. Cold dough doesn’t spread as fast in the oven, giving the cookies time to rise before they widen. Skipping the chill produces thin, crispy M&M cookies that look nothing like the photo.
Step 3: Bake
Preheat oven to 375°F. Line baking sheets with parchment paper. Scoop cold dough into large balls (about 3 tablespoons each — these are big, generous cookies). Place 3 inches apart on prepared sheets — they need room to spread. Bake for 10-12 minutes until edges are set and lightly golden but the centers still look slightly underdone and glossy.
Step 4: Press M&Ms on Top Immediately
While cookies are still hot from the oven, immediately press 4-5 reserved M&Ms into the top of each cookie. They will slightly sink into the warm dough. This ensures every cookie has visible, colorful M&Ms on top — some of the folded-in candies end up underneath during baking. Pressing extras on top fixes the visual and adds another pop of color and candy in every bite.
Step 5: Cool on Pan
Let cookies cool on the baking sheet for 8-10 minutes before transferring. They need to firm up significantly on the hot pan. Moving too early causes them to fall apart. The centers will continue to set as they cool — this is the carryover cooking doing its job. Transfer to a wire rack and cool another 10 minutes for full texture development.
Tips & Common Mistakes
- Don’t skip the chill — this is the entire reason these stay thick. 1 hour minimum, 24 hours ideal.
- Make cookies big — small scoops produce thin cookies. Use a generous 3-tablespoon scoop for proper thickness.
- Reserve M&Ms for pressing — don’t put all candies in the dough. The reserved ones pressed on top make every cookie look professional.
- Use parchment, not silicone mats — silicone mats hold more heat and can cause bottoms to overbake. Parchment provides more even heat distribution.
- Cornstarch is the secret — it inhibits gluten development and keeps centers tender longer.
- Store with bread slice — the bread slice in the container trick works especially well for these — they stay soft for 5+ days.
Variations
- Holiday M&M Cookies: Use seasonal M&M colors (red and green for Christmas, pastels for Easter, orange and black for Halloween). Same cookie, immediately festive. Perfect alongside soft frosted sugar cookies on a holiday platter.
- M&M Chocolate Chip Combo: Replace 1/2 cup M&Ms with semi-sweet chocolate chips. The combination of chocolate and candy in every bite is genuinely over the top.
- Peanut M&M Version: Use peanut M&Ms instead of plain. The peanut adds crunch and protein. These are slightly thicker because of the candy size — press in gently.
- Mini M&M Version: Use mini M&Ms throughout the dough for more even color distribution. You get candy in every single bite rather than concentrated pockets.
- Brown Butter Base: Brown the butter before creaming for a nutty depth behind all the candy sweetness. Cool completely before creaming. Changes the cookie from straightforward sweet to complex sweet. See chocolate bundt cake for another recipe where butter treatment matters.
Storage & Make-Ahead
- Room temperature: Airtight container for 5-6 days. M&M candies develop a slight sugar shell over time that actually adds crunch.
- Freezer (baked): Freeze in a single layer first, then transfer to bags. Keeps 2 months. The M&M colors may bleed slightly from freezer moisture but this is cosmetic only.
- Freezer (dough): Scoop balls and freeze raw on a baking sheet, then transfer to a bag. Bake from frozen at 375°F for 13-14 minutes.
- Make-ahead parties: Make dough up to 3 days ahead. Keep refrigerated and bake on demand. Fresh-baked cookies at a party beats any pre-baked container every time.
- Gift packaging: Stack in cellophane bags tied with ribbon. The colorful M&Ms make these visually appealing as gifts without any additional decoration.
Frequently Asked Questions
Why are my M&M cookies spreading flat?
Almost certainly the dough wasn’t cold enough. Always bake from cold, rested dough. If using dough straight from mixing, you’ll get thin cookies. Also check that your butter wasn’t melted — room temperature means soft and pliable, not warm or greasy. Creamed butter holds more air than melted butter, which helps cookies rise.
Can I use peanut butter M&Ms or other varieties?
Yes — any M&M variety works. Peanut butter and pretzel M&Ms add texture variation. Crispy M&Ms fold in cleanly. Just avoid M&Ms with soft caramel centers as they can bleed during baking. Standard plain or peanut M&Ms are the most reliable.
My cookies are raw in the center after 12 minutes — what’s wrong?
Check your oven temperature with an oven thermometer — many ovens run 25-50°F low. If oven temperature is correct, your dough balls may be too large. Scale back to 2 tablespoons and check at 10 minutes. Also make sure you’re not stacking cookies — each sheet needs to be on its own rack with air circulation.
Do the M&M colors bleed into the dough?
Occasionally they can if the dough is very wet or the cookie is underbaked. Using chilled dough minimizes this. If you see slight color transfer in the finished cookie, it’s completely cosmetic and doesn’t affect flavor. The pressed-on-top M&Ms stay bright regardless because they’re not mixed into warm dough.
Can I halve this recipe?
Easily — halve all ingredients and use 1 egg (not an egg and a yolk). Makes about 18 large cookies. Good for small households where having 36 cookies around is a willpower test rather than a gift.
