No-Bake Monster Cookies Recipe
Introduction
No-Bake Monster Cookies are a delightful treat packed with peanut butter, oats, chocolate, and colorful M&M’s. These bars come together quickly without any oven time, making them perfect for an easy, crowd-pleasing dessert or snack.

Ingredients
- 6 tablespoons butter, softened
- 6 tablespoons sugar
- ¼ cup brown sugar
- ¾ cup creamy peanut butter
- 6 tablespoons quick cooking oats, pulsed in food processor
- 1 teaspoon vanilla extract
- ½ teaspoon salt
- 1½ cups quick cooking oats, not pulsed
- 10 tablespoons miniature M&M’s, divided (8 tablespoons and 2 tablespoons)
- 1 cup semi-sweet chocolate chips
- 3 tablespoons heavy cream
Instructions
- Step 1: Prepare an 8-inch baking dish by lining it with foil or parchment paper. Set aside.
- Step 2: In a large mixing bowl, cream together the softened butter, sugar, and brown sugar until smooth. Add the peanut butter and mix well until fully combined.
- Step 3: Stir in the 6 tablespoons of pulsed quick oats, vanilla extract, and salt. Gradually fold in the 1½ cups of whole quick oats, then gently fold in 8 tablespoons of the miniature M&M’s.
- Step 4: Press the cookie mixture evenly into the prepared baking dish.
- Step 5: In a small microwave-safe bowl, combine the chocolate chips and heavy cream. Heat in 30-second intervals, stirring between each, until the chocolate is melted and smooth. Spread the melted chocolate evenly over the cookie mixture.
- Step 6: Sprinkle the remaining 2 tablespoons of miniature M&M’s over the chocolate layer. Cover and refrigerate for at least 2 hours or until firm.
- Step 7: Once set, remove from the refrigerator and cut into squares. Serve and enjoy!
Tips & Variations
- For a nut-free option, substitute sunflower seed butter for the peanut butter.
- You can use rolled oats instead of quick cooking oats, but pulsing them slightly will help with texture.
- Try adding chopped nuts or shredded coconut to the mix for extra crunch and flavor.
- If you prefer a richer chocolate topping, use dark chocolate chips instead of semi-sweet.
Storage
Store the monster cookies in an airtight container in the refrigerator for up to one week. You can also freeze them for up to 2 months; thaw in the refrigerator before serving. These bars are best served chilled or at room temperature.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I use crunchy peanut butter instead of creamy?
Yes, crunchy peanut butter can be used and will add a bit of extra texture to the cookies.
Do I have to refrigerate these cookies?
Refrigeration helps the cookies set properly and keeps the topping firm, but if you prefer a softer texture, you can let them set at room temperature. Keep in mind they may be less firm without refrigeration.
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No-Bake Monster Cookies Recipe
- Total Time: 2 hours 15 minutes
- Yield: 12 bars 1x
Description
Delicious and easy No-Bake Monster Cookies packed with peanut butter, oats, chocolate chips, and colorful M&M’s. These bars are quick to prepare, combining creamy textures with crunchy candies, making them a perfect treat that requires no baking and sets in the refrigerator.
Ingredients
Cookie Base
- 6 tablespoons butter, softened
- 6 tablespoons sugar
- ¼ cup brown sugar
- ¾ cup creamy peanut butter
- 6 tablespoons quick cooking oats, pulsed in food processor
- 1 teaspoon vanilla extract
- ½ teaspoon salt
- 1½ cups quick cooking oats, not pulsed
- 8 tablespoons miniature M&M’s
Topping
- 1 cup semi-sweet chocolate chips
- 3 tablespoons heavy cream
- 2 tablespoons miniature M&M’s
Instructions
- Prepare the pan: Line an 8-inch baking dish with foil or parchment paper, allowing some overhang for easy removal later. Set aside.
- Cream butter and sugars: In a large mixing bowl, combine the softened butter, sugar, and brown sugar. Mix until smooth and creamy to incorporate air for a fluffy texture.
- Add peanut butter and dry ingredients: Stir in the creamy peanut butter until well blended. Add the 6 tablespoons of pulsed quick oats, vanilla extract, and salt. Slowly fold in the remaining 1½ cups of quick oats and 8 tablespoons of miniature M&M’s until evenly mixed.
- Press mixture into pan: Transfer the dough mixture into your prepared pan and firmly press it down in an even layer to create the cookie base.
- Prepare chocolate topping: In a microwave-safe bowl, combine semi-sweet chocolate chips and heavy cream. Microwave in 30-second intervals, stirring each time until the chocolate melts completely and forms a smooth ganache.
- Top and garnish: Spread the melted chocolate ganache evenly over the cookie base. Sprinkle the remaining 2 tablespoons of miniature M&M’s on top for a decorative and crunchy finish.
- Chill to set: Cover the pan and refrigerate for at least 2 hours, or until the bars are firm and set. Once set, lift the block from the pan using the foil or parchment paper overhang and cut into squares.
Notes
- You can substitute creamy peanut butter with natural or chunky peanut butter for added texture.
- Make sure to pulse the initial oats finely to give a smoother cookie base.
- For a dairy-free version, use vegan butter and coconut cream instead of butter and heavy cream.
- Press the mixture firmly to ensure bars hold together well after chilling.
- Store refrigerated in an airtight container for up to 1 week.
- Microwave times may vary, so watch the chocolate closely to prevent burning.
- Prep Time: 15 minutes
- Cook Time: 0 minutes
- Category: Desserts
- Method: No-Cook
- Cuisine: American
Keywords: No-Bake Monster Cookies, Peanut Butter Cookies, Oatmeal Cookies, No-Bake Dessert, Easy Cookies, M&M Bars

