M&M No Bake Chocolate Peanut Butter Oat Cups

You all loved our no bake peanut butter oat cups, so you’re going to flip for this monster cookie version. They’re rich, chocolatey, loaded with peanut butter, oats, and colorful M&M’s, and the best part is there’s absolutely no baking required.

These no-bake chocolate peanut butter oat cups are easy to make, fun to share, and perfect for everything from after school snacks to late-night sweet cravings.

We were blown away by how crazy VIRAL our original peanut butter oat cups went a few weeks ago, but the truth is, there’s another version that we love even more!

Years ago we loved taking our kids to Lagoon amusement park in Utah and I’d always throw in some fun little monster m&m energy bites. Well, the more we made them the more we experimented! This is hands down our family’s preferred recipe!

Why You’ll Love These Monster Cookie Oat Cups

You can tell just by looking at them that you’re going to love these chocolate peanut butter oat cups! Let me tell you why…

• No bake, no oven required
• Chewy monster cookie texture and flavor
• Colorful and kid-friendly
• Easy, so easy kids can make them!
• No added refined sugar
• Made with pantry ingredients
• High-protein dessert

Ingredients You’ll Need

These no bake oat cups come together with simple pantry staples and a few fun add-ins. Each ingredient plays a role in creating that classic monster cookie flavor with plenty of chewy texture and chocolatey crunch.

• Old Fashioned Oats: Give the cups their hearty, chewy base and help everything hold together.
• Protein Powder: Adds structure and a little protein boost while keeping the texture soft and no bake friendly.
• Peanut Butter: Creamy, rich, and full of flavor—this is the glue that holds the oat cups together.
• Maple Syrup: Naturally sweetens the mixture and adds a subtle, cozy flavor.
• Vanilla Extract: Enhances all the flavors and adds a hint of warmth.
• Salt: Balances the sweetness and makes the chocolate and peanut butter pop.
• Mini M&M’s: Add color, crunch, and that classic monster cookie vibe.

For the Topping

• Chocolate Chips: Melt into a smooth, rich layer that finishes the cups perfectly. Use semi-sweet or dark or a combination if you want!
• Peanut Butter Chips: Add extra peanut butter flavor and pair perfectly with the chocolate. (More chocolate chips work great too!)
• Mini M&M’s: Sprinkled on top for extra crunch and fun pops of color.
• Flaked Salt: A light sprinkle brings out the sweetness and adds a subtle finishing crunch.

Our Favorite Protein Powders

We’ve tried every protein powder under the sun and we have two favorite brands…

Just Ingredients and Ascent.

We aren’t partners with either of them or anything. We just love their products and think they taste the best. For this recipe, I used vanilla protein powder.

How to Make No Bake M&M Oat Cups

1. Combine: Add all the ingredients for the peanut butter oat base to a medium bowl and mix until combined.
2. Fold: Add the m&m’s and fold them into the oat mixture.
3. Place in Muffin Pan: Place the oat mixture into the muffin cups lined with paper liners. Try to distribute the mixture even across 8 cups. Flatten the mixture as much as possible.
4. Freeze: Place the pan in the freezer for at least 2 hours.
5. Melt: Place the chocolate and peanut butter chips in a pan and melt until smooth (or melt in the microwave in 30 second intervals).
6. Top with Chocolate: Pour a spoonful or two of melted chocolate over each oat cup and smooth it out.
7. Sprinkle: Sprinkle with flaked sea salt and a few mini m&m’s.
8. Freeze: Place into the refrigerator until the chocolate sets or place in the freezer for another hour.

Variations and Add-Ins

There are so many fun variations and add-ins that you can try with these oat cups. You can swap the peanut butter with almond butter or sunbutter.

You could also substitute the m&m’s with a different favorite candy like Reese’s Pieces or even mini chocolate chips. Coconut lovers can add some coconut flakes for some extra texture and sweetness.

How to Store No Bake Oat Cups

Leftover no bake monster cookie cups should be stored in the refrigerator or freezer in an airtight container. They will keep for up to a month.

These M&M no bake chocolate peanut butter oat cups are easy, colorful, and packed with that classic monster cookie flavor everyone loves.

More Easy No Bake Desserts:

Watch How These Oat Cups are Made…