Easy Fudgy M&M Brownies

Featured in Irresistible Sweet Treats.

Rich chocolate brownies filled with M&Ms, ready in 55 minutes. Mix wet and dry ingredients, fold in candies, bake at 350°F for 35-40 minutes until edges are set but center is fudgy.
Clare Greco
Updated on Fri, 14 Feb 2025 12:04:02 GMT
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Childhood memories come flooding back every time I make these Cosmic Brownies. Not the store-bought kind we all remember from our lunchboxes, but something even better - rich, fudgy squares of pure chocolate bliss topped with silky ganache and colorful candy gems. In my tiny kitchen, with chocolate smeared on my apron and probably a bit on my face, I've spent countless weekends perfecting this recipe. The secret? Real chocolate, plenty of butter, and just enough patience to let them cool before diving in.

Last Saturday, I brought these to my nephew's birthday party. The kids devoured them while the parents kept sneaking back for 'just one more piece.' By the end of the party, my sister-in-law was clutching the recipe like it was made of gold.

Essential Ingredients

  • Chocolate: Spring for the good stuff here. I use a mix of Dutch-process cocoa and semi-sweet chocolate bars. After ruining one too many batches with cheap chocolate, I've learned this isn't the place to cut corners
  • Butter: Unsalted is your best friend, melted until it's just liquid but not hot. One time I got impatient and used hot butter - ended up with greasy brownies that taught me a valuable lesson in patience
  • Eggs: Room temperature eggs make all the difference. I forgot to take them out early once and tried the old warm water trick - not the same! Plan ahead and let them sit out
  • Sugar: Two kinds create that perfect crust on top. I learned this trick from my grandmother, who made the best brownies in three counties
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Detailed Instructions

First up, your pan needs love. Line it with parchment paper, letting it hang over the sides. Trust me, you'll thank yourself later when the brownies lift out like a dream. A light spritz of baking spray is like insurance - use it.

Let's bake these beauties. Start by melting your chocolate and butter together - slowly, gently, like you're trying not to wake a sleeping baby. I've burned more chocolate than I care to admit by rushing this step. Now the kitchen fills with that incredible chocolate aroma that always brings my kids running to see what's baking.

For the perfect brownie texture, whisk those eggs and sugars until your arm gets tired. Actually, keep going even after that. You want the mixture to look like pale silk, almost ribbon-like when it falls from the whisk. One rainy Sunday, I discovered that this step makes all the difference between good brownies and great ones.

Remember my first attempt at these? The ganache was lumpy, the brownies overcooked, and the candies rolled right off the top. Now, three years and countless batches later, I've learned that patience makes perfect - especially when chocolate's involved.

Making it Perfect

Sometimes the ganache will look like it's refusing to come together. Keep stirring. It's like magic - one minute you've got a grainy mess, the next, silk. I've stood in my kitchen at midnight, stirring and wondering if I should start over, only to have it suddenly transform.

Sweet Success Stories

These brownies have become my signature bring-along for every occasion. They've survived summer picnics, winter bake sales, and one memorable road trip where they ended up slightly squished but still delicious. The recipe card is stained with chocolate fingerprints and covered in notes - the sign of a well-loved recipe.

Mixing Things Up

When winter hits, I sometimes add a tiny drop of peppermint extract. During fall, a pinch of cinnamon. My daughter loves when I swap the candy topping for crushed Oreos. The base recipe is like a favorite pair of jeans - reliable, comfortable, but fun to dress up differently.

Keeping The Magic Alive

Store these in a good container - not like my great-aunt Mary who used old margarine tubs for everything. Layer parchment between them if you're stacking. They'll stay fudgy and perfect for five days in the fridge, though they've never lasted that long at my house.

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Professional Secrets

  • Your chocolate should be chopped fine enough to see through it if you hold it up to light
  • Let your eggs sit out overnight - yes, really. They'll blend better that way
  • When in doubt, underbake. You can't fix overbaked brownies, but slightly underdone ones are just 'extra fudgy'

After making these brownies for birthdays, bake sales, potlucks, and 'just because it's Wednesday' occasions, I can tell you one thing - they never get old. Each batch is a little piece of childhood wrapped in chocolate, topped with memories, and sprinkled with joy. Whether you're an experienced baker or just starting out, these brownies remind us that sometimes the best things in life are made with chocolate and shared with love.

Frequently Asked Questions

→ Can I use different types of M&Ms in this recipe?
Yes, you can use any variety of M&Ms like peanut, crispy, or dark chocolate. Just keep the total amount the same as the recipe suggests.
→ Why are my brownies too cakey?
This usually happens if the flour is compacted. Make sure to spoon and level your flour, or better yet, use a kitchen scale for accurate measurement.
→ How do I know when the brownies are done?
The edges should be set but the middle should still be slightly underdone. They'll continue cooking as they cool in the pan.
→ How should I store these brownies?
Store in an airtight container at room temperature for up to 5 days, or freeze for up to 3 months.
→ Why do the ingredients need to be room temperature?
Room temperature ingredients blend better and create a smoother batter, leading to fudgier brownies with the perfect texture.

Easy Chocolate M&M Brownies

Indulgent homemade brownies packed with regular and mini M&Ms for the perfect chocolate treat that kids and adults will love.

Prep Time
20 Minutes
Cook Time
35 Minutes
Total Time
55 Minutes

Category: Sweet Treats

Difficulty: Intermediate

Cuisine: American

Yield: 16 Servings (16 brownies)

Dietary: Vegetarian

Ingredients

→ Base Ingredients

01 1½ cups white sugar, the regular granulated kind
02 ½ cup powdered sugar, for that perfect texture
03 3 large eggs, straight from the fridge
04 1 egg yolk, for extra richness
05 ½ cup unsalted butter, melted and slightly cooled
06 ½ cup vegetable or canola oil
07 1 teaspoon pure vanilla extract

→ Dry Mix

08 1 cup all-purpose flour, spooned and leveled
09 1 cup unsweetened cocoa powder
10 1 tablespoon cornstarch, for that fudgy texture
11 1 teaspoon salt

→ Mix-ins

12 ⅓ cup semi-sweet chocolate chips
13 ¾ cup regular M&M's
14 ½ cup mini M&M's

Instructions

Step 01

Turn your oven to 350°F and get it heating up. Take a 9x9 inch pan and give it a good coating of baking spray. Line the bottom and two sides with parchment paper, then spray again to make sure nothing sticks.

Step 02

In a bowl, whisk together your flour, cocoa powder, cornstarch, and salt until they're well combined. Set this aside for now.

Step 03

Using your mixer, beat both sugars, eggs, and the extra yolk on high for about 2 minutes until they're really well combined and a bit fluffy.

Step 04

Pour in your melted butter, oil, and vanilla. Mix these in on low speed. Now gradually add your dry ingredients, mixing just until everything comes together - don't overmix!

Step 05

Take the bowl off the mixer and fold in your chocolate chips and both sizes of M&M's using a spatula. Be gentle but make sure they're evenly distributed.

Step 06

Spread the batter evenly in your prepared pan. If you want, sprinkle some extra M&M's on top. Bake for 35-40 minutes - you want the edges set but the middle still a little underdone. It'll finish cooking as it cools.

Step 07

Put the pan on a cooling rack and let it cool completely before cutting into squares. Patience is key here!

Notes

  1. These brownies are extra fudgy when slightly underbaked - trust the process!
  2. For high altitude baking, add an extra tablespoon of flour to the recipe
  3. Pull your eggs and butter out 2 hours before baking for best results

Tools You'll Need

  • 9x9 inch baking pan
  • Electric mixer
  • Parchment paper
  • Mixing bowls
  • Rubber spatula

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Contains eggs
  • Contains dairy
  • Contains wheat (gluten)

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 254
  • Total Fat: 15 g
  • Total Carbohydrate: 34 g
  • Protein: 2 g