Monster Cookies are the ultimate treat, packed with chewy oats, rich chocolate chips, and crunchy M&M’s for a burst of flavor in every bite. These cookies are a delightful mix of textures, from the soft center to the slightly crisp edges, making them irresistible. With just 15 minutes of prep and a quick bake time of 11 minutes, they’re perfect for satisfying your sweet tooth without spending hours in the kitchen.
Each cookie is a hearty indulgence, offering a perfect balance of sweetness and richness, while the 30-minute chill time ensures they hold their shape beautifully. Whether you’re baking for a crowd or treating yourself, these cookies are guaranteed to bring smiles and requests for seconds. Their vibrant colors and comforting flavors make them a standout dessert for any occasion.
Monster Cookies Ingredients
- 10 Tablespoons (141 g) unsalted butter (softened to room temperature)
- ⅔ cup (135 g) light or dark brown sugar (tightly packed)
- ¼ cup (50 g) sugar
- ½ cup (140 g) creamy peanut butter* (use natural or regular)
- 1 large egg
- 1 teaspoon vanilla extract
- 1 cup (125 g) all-purpose flour
- 1 teaspoon cornstarch
- ¾ teaspoon baking soda
- ¾ teaspoon salt
- 1 cup (115 g) quick oats
- ⅓ cup (60 g) butterscotch chips
- ⅓ cup (60 g) semisweet chocolate chips
- ½ cup (100 g) candy-coated chocolates (like M&Ms or Unreal chocolates)
How to Make Monster Cookies
- In a stand mixer or large bowl, combine butter, brown sugar, sugar, and peanut butter. Beat on medium speed until creamy and well-combined.
- Add the egg and vanilla extract. Mix until fully incorporated.
- In a separate bowl, whisk together the flour, cornstarch, baking soda, and salt.
- Gradually add the dry ingredients to the wet mixture. Mix on low speed until just combined, scraping the sides and bottom of the bowl as needed.
- Fold in the quick oats, butterscotch chips, semisweet chips, and candy-coated chocolates until evenly distributed.
- Cover the dough with plastic wrap and refrigerate for at least 30 minutes (or overnight if preferred).
- Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
- Roll the dough into 3 Tablespoon-sized balls and place them on the prepared sheet, spacing them at least 2 inches apart. Gently flatten each ball with your hand.
- Bake for 13-14 minutes, or until the edges are lightly golden brown.
- Allow the cookies to cool completely on the baking sheet before serving. Enjoy!
How to Store and Keep Monster Cookies Fresh
Once your Monster Cookies have cooled completely, store them in an airtight container at room temperature for up to 5 days. For longer storage, you can freeze the cookies in a freezer-safe bag or container for up to 3 months. Pro tip: Place parchment paper between layers to prevent sticking!
Fun Variations to Customize Your Monster Cookies
Feel free to mix and match your add-ins! Swap butterscotch chips for white chocolate chips, or use peanut butter chips instead of semisweet. For a nut-free version, replace peanut butter with sunflower seed butter. You can also add chopped nuts or dried fruit for extra texture and flavor.
Time-Saving Tips for Busy Bakers
If you’re short on time, skip the chilling step—just bake the cookies right away for a slightly thinner, chewier result. Alternatively, prepare the dough ahead of time and refrigerate it overnight. You can also roll the dough into balls and freeze them for quick baking later!
Perfect Pairings: Serving Suggestions
These Monster Cookies are delicious on their own, but they’re even better with a cold glass of milk or a scoop of vanilla ice cream. For a fun twist, crumble them over yogurt or use them as a base for an ice cream sandwich. They’re also a great addition to any dessert platter!
Common Questions About Monster Cookies
Can I use old-fashioned oats instead of quick oats? Yes, but the texture will be slightly chewier. Can I make these gluten-free? Absolutely! Just swap the all-purpose flour for a gluten-free blend. Why chill the dough? Chilling helps prevent the cookies from spreading too much and enhances the flavors.
Monster Cookies
Ingredients
- 10 Tablespoons unsalted butter softened to room temperature
- ⅔ cup light or dark brown sugar tightly packed
- ¼ cup sugar
- ½ cup creamy peanut butter *
- 1 large egg
- 1 teaspoon vanilla extract
- 1 cup all-purpose flour
- 1 teaspoon cornstarch
- ¾ teaspoon baking soda
- ¾ teaspoon salt
- 1 cup quick oats
- ⅓ cup butterscotch chips
- ⅓ cup semisweet chips
- ½ cups candy coated chocolates Like M&Ms or Unreal chocolates
Instructions
- Combine butter, sugars, and peanut butter in the bowl of a stand mixer (or in a large bowl and use an electric mixer) and beat until creamy and well-combined.
- Add egg and vanilla extract and stir well.
- In a separate bowl, whisk together flour, cornstarch, baking soda, and salt.
- Add your flour mixture to your wet ingredients and stir (with mixer on low speed so that you don’t send flour flying everywhere!) until flour is completely incorporated into the batter. Be sure to scrape the sides and bottom of the bowl so that ingredients are well-combined.
- Add oats, chocolate and butterscotch chips, and M&Ms and stir well.
- Cover cookie dough with plastic wrap and transfer to the refrigerator. Allow dough to chill for at least 30 minutes (this dough may be chilled longer or even overnight if needed).
- 15 minutes before dough is finished chilling, preheat your oven to 350F (175C) and line cookie sheet with parchment paper.
- Once dough has chilled, remove from the refrigerator and roll into 3 Tablespoon-sized balls and place on prepared cookie sheet, spacing cookie dough at least 2″ apart. Use your hand to gently flatten each cookie. Bake on 350F (175C) for 13-14 minutes or until edges are beginning to turn light golden brown. Allow cookies to cool completely on baking sheet before enjoying.