If you love cookies packed with flavor and texture, this Monster Cookie Recipe will be your new favorite. With a delicious blend of peanut butter, oats, chocolate chips, and M&M’s, these cookies are soft, chewy, and colorful. Perfect for parties, lunchboxes, or an anytime treat, they’re a true crowd-pleaser. The best part is that they’re easy to make and freeze beautifully for future cookie cravings.

Ingredients
- 1 cup all-purpose flour
- ½ teaspoon baking powder
- ½ teaspoon baking soda
- ¼ teaspoon salt
- ½ cup unsalted butter, softened
- ⅔ cup brown sugar
- ¼ cup granulated sugar
- ½ cup creamy peanut butter
- 1 large egg, room temperature
- 1 teaspoon vanilla extract
- 1 cup old-fashioned rolled oats
- 1 cup semi-sweet chocolate chips
- ¾ cup mini or regular M&M’s
Instructions
- Preheat oven to 350°F and line a baking sheet with parchment paper.
- In a bowl, whisk together flour, baking powder, baking soda, and salt.
- In a stand mixer or using a hand mixer, cream together butter, brown sugar, and granulated sugar until fluffy.
- Mix in the peanut butter until smooth, then add egg and vanilla extract.
- Gradually add the flour mixture, mixing just until combined. Scrape the bowl as needed.
- Fold in rolled oats, chocolate chips, and M&M’s.
- Scoop dough with a 1 ½ tablespoon cookie scoop and place onto the prepared baking sheet.
- Bake for 10–12 minutes until lightly golden.
- Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack.

Serving and Storage Tips
- Serve warm for the best gooey chocolate flavor.
- Pair with a glass of milk, coffee, or hot cocoa.
- Store in an airtight container at room temperature for up to 5 days.
- To keep them soft, place a slice of bread inside the container.
- Freeze baked cookies for up to 3 months in a freezer-safe bag.
- Freeze unbaked dough balls on a tray, then store in a bag for easy baking later.
Variations
- Nutty Monster Cookies: Add chopped pecans, walnuts, or peanuts for extra crunch.
- Reese’s Lovers: Swap M&M’s with Reese’s Pieces for a double peanut butter treat.
- Gluten-Free: Use gluten-free flour and certified gluten-free oats.
- Dark Chocolate Delight: Replace semi-sweet chips with dark chocolate for a richer flavor.
- Holiday Special: Use red and green M&M’s for Christmas, pastels for Easter, or orange and black for Halloween.
- Double Chocolate: Add 2 tablespoons of cocoa powder to the dough for chocolate-based monster cookies.
- Trail Mix Style: Mix in raisins, dried cranberries, or sunflower seeds for a fun twist.
FAQs
- Can I use quick oats instead of rolled oats? – Yes, but the texture will be softer and less chewy.
- Can I use crunchy peanut butter? – Absolutely, it adds extra crunch and nutty flavor.
- Do I need to chill the dough? – No, this recipe works without chilling, but chilling helps prevent spreading if your kitchen is warm.
- Can I make them larger? – Yes, use a bigger scoop and increase the baking time by 2–3 minutes.
- Can I make these cookies nut-free? – Swap peanut butter for sunflower seed butter and skip nuts.
- How do I keep them chewy? – Do not overbake; remove them when they’re just set and lightly golden.
- Can I add other candies? – Yes, chopped Snickers, Reese’s cups, or sprinkles work great.
- Why are they called Monster Cookies? – Because they’re “monstrously” full of mix-ins like oats, candy, chocolate, and peanut butter.
- Can I freeze the dough? – Yes, freeze dough balls, then bake straight from frozen by adding 1–2 minutes to baking time.
- Can I double the recipe? – Yes, this recipe doubles easily for parties or holiday baking.
Monster Cookies are a classic favorite for good reason. They’re soft, chewy, colorful, and packed with flavor, making them the perfect dessert for any occasion. With easy variations and freezer-friendly options, this recipe is a must-have in your baking collection. Bake a batch today and enjoy cookies that everyone will love.
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Monster Cookie Recipe
Description
If you love cookies packed with flavor and texture, this Monster Cookie Recipe will be your new favorite. With a delicious blend of peanut butter, oats, chocolate chips, and M&M’s, these cookies are soft, chewy, and colorful. Perfect for parties, lunchboxes, or an anytime treat, they’re a true crowd-pleaser. The best part is that they’re easy to make and freeze beautifully for future cookie cravings.
Ingredients
- 1 cup all-purpose flour
- ½ teaspoon baking powder
- ½ teaspoon baking soda
- ¼ teaspoon salt
- ½ cup unsalted butter, softened
- ⅔ cup brown sugar
- ¼ cup granulated sugar
- ½ cup creamy peanut butter
- 1 large egg, room temperature
- 1 teaspoon vanilla extract
- 1 cup old-fashioned rolled oats
- 1 cup semi-sweet chocolate chips
- ¾ cup mini or regular M&M’s
Instructions
- Preheat oven to 350°F and line a baking sheet with parchment paper.
- In a bowl, whisk together flour, baking powder, baking soda, and salt.
- In a stand mixer or using a hand mixer, cream together butter, brown sugar, and granulated sugar until fluffy.
- Mix in the peanut butter until smooth, then add egg and vanilla extract.
- Gradually add the flour mixture, mixing just until combined. Scrape the bowl as needed.
- Fold in rolled oats, chocolate chips, and M&M’s.
- Scoop dough with a 1 ½ tablespoon cookie scoop and place onto the prepared baking sheet.
- Bake for 10–12 minutes until lightly golden.
- Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack.
Notes
- Serve warm for the best gooey chocolate flavor.
- Pair with a glass of milk, coffee, or hot cocoa.
- Store in an airtight container at room temperature for up to 5 days.
- To keep them soft, place a slice of bread inside the container.
- Freeze baked cookies for up to 3 months in a freezer-safe bag.
- Freeze unbaked dough balls on a tray, then store in a bag for easy baking later.