Chewy Monster Cookies (Peanut Butter)
If you’re searching for the ultimate sweet treat that combines the flavors of peanut butter, chocolate, and a little bit of nostalgia, then look no further! These Chewy Monster Cookies (Peanut Butter) are a delightful explosion of textures and tastes. With creamy peanut butter as the star of the show, these cookies are loaded with M&M candies, semi-sweet chocolate chips, and crunchy salted peanuts. The perfect indulgence for parties, lunchboxes, or just a cozy night in, these cookies are sure to become a favorite in your baking repertoire.
Why This Chewy Monster Cookies (Peanut Butter) Stands Out
These cookies are not your average cookies; they are a celebration of flavors and a feast for the senses. The combination of creamy peanut butter and rich chocolate creates a chewy texture that’s simply irresistible. What sets them apart is the variety of mix-ins that provide a satisfying crunch and burst of color, making them visually stunning as well as delicious. Plus, they are easy to make and perfect for sharing with friends and family, or keeping all to yourself!
Ingredient List
- 1 cup (227g) unsalted butter, room temperature
- 1 cup creamy peanut butter, room temperature
- 2 teaspoons pure vanilla extract
- 1 and 1/4 cups (269g) light brown sugar, packed
- 1/3 cup (66g) granulated sugar
- 2 large eggs, room temperature
- 1 large egg yolk, room temperature
- 1 and 3/4 cups (210 grams) all-purpose flour
- 3/4 cup old-fashioned oats
- 1/2 cup quick oats
- 1 teaspoon baking soda
- 1 teaspoon baking powder
- 1/2 teaspoon ground cinnamon
- 1/2 teaspoon salt
- 1 and 1/2 cups M&M candies
- 1 and 1/2 cups semi-sweet chocolate chips
- 1/2 cup salted peanuts, roughly chopped
Equipment & Tools
- Mixing bowls – for combining ingredients.
- Electric mixer – to cream the butter and sugars smoothly.
- Baking sheets – for placing the cookie dough.
- Parchment paper – to prevent sticking and for easy cleanup.
- Cookie scoop – for uniform cookie sizes.
- Cooling rack – to let the cookies cool perfectly.
Make Chewy Monster Cookies (Peanut Butter): A Simple Method

Step 1: Preheat Your Oven
Preheat your oven to 350°F (175°C). This step is crucial for achieving the perfect texture.
Step 2: Cream the Butter and Peanut Butter
In a large mixing bowl, combine the room temperature unsalted butter and creamy peanut butter. Using an electric mixer, beat them together until the mixture is smooth and creamy.
Step 3: Add Sugars and Vanilla
Add the light brown sugar and granulated sugar to the bowl. Beat until well combined and fluffy. Then, mix in the pure vanilla extract for that extra flavor boost.
Step 4: Incorporate the Eggs
Add the two large eggs and the additional egg yolk, one at a time, mixing well after each addition to ensure they are fully incorporated.
Step 5: Mix Dry Ingredients
In a separate bowl, whisk together the all-purpose flour, old-fashioned oats, quick oats, baking soda, baking powder, ground cinnamon, and salt. Gradually add this dry mixture to the wet ingredients, mixing until just combined.
Step 6: Fold in the Fun Stuff
Gently fold in the M&M candies, semi-sweet chocolate chips, and chopped salted peanuts. This is where the “monster” in these cookies comes to life!
Step 7: Scoop the Dough
Using a cookie scoop, portion out the dough onto prepared baking sheets lined with parchment paper. Leave enough space between each cookie for spreading.
Step 8: Bake
Bake the cookies in the preheated oven for about 10-12 minutes, or until the edges are lightly golden. The centers may look a bit underbaked, but they will continue to cook as they cool.
Step 9: Cool and Enjoy
Remove the baking sheets from the oven and let the cookies cool on them for about 5 minutes before transferring them to a cooling rack. Enjoy your chewy monster cookies warm or at room temperature!
Make It Your Way
- Substitute the M&M candies with chocolate chunks for a richer chocolate flavor.
- Use crunchy peanut butter instead of creamy for added texture.
- Incorporate coconut flakes for a tropical twist.
- Add dried fruits like cranberries or raisins for a chewy surprise.
Things That Go Wrong
- Cookies spread too much: Ensure your butter is softened but not melted. Cold dough can help maintain shape.
- Cookies are dry: Be careful not to overmix the dough once you combine the flour. Too much mixing can lead to tough cookies.
- Uneven baking: Rotate your baking sheets halfway through baking to ensure even cooking.
- Cookies are too hard: If overbaked, they can become hard. Keep an eye on them towards the end of the baking time.
Storing, Freezing & Reheating
To store your Chewy Monster Cookies (Peanut Butter), place them in an airtight container at room temperature for up to a week. For longer storage, you can freeze the cookies. Simply wrap them individually in plastic wrap and place them in a freezer bag. They will stay fresh for up to three months. When you’re ready to enjoy them, thaw at room temperature or pop them in the microwave for a few seconds to warm them up.
Handy Q&A
Can I use natural peanut butter for this recipe?
Yes, you can use natural peanut butter, but keep in mind that it might affect the texture slightly. Natural peanut butter can be more runny, so try to choose one that is stirred well and has a similar consistency to creamy peanut butter.
What if I don’t have eggs?
If you’re out of eggs, you can substitute each egg with 1/4 cup of unsweetened applesauce or 1/4 cup of mashed banana. This will help bind the ingredients together while adding a hint of sweetness.
Can I make these cookies gluten-free?
Absolutely! Substitute all-purpose flour with a 1:1 gluten-free baking flour blend. Just check that your oats are certified gluten-free if you have a gluten sensitivity.
How do I make my cookies chewier?
For chewier cookies, try chilling the dough for at least 30 minutes before baking. This helps the cookies retain their shape and results in a moist and chewy texture.
One Pan, More Ideas
- For more delicious cookie recipes, check out Sally’s Baking Addiction.
- Explore unique flavor combinations at Pinch of Yum.
- Find various vegan options at Minimalist Baker.
See You at the Table
Now that you have your hands on this delightful recipe for Chewy Monster Cookies (Peanut Butter), it’s time to gather your loved ones around the table and enjoy these sweet treats together. Baking is all about sharing joy, and what better way to create memories than with a batch of cookies that everyone will love? Happy baking!

Chewy Monster Cookies (Peanut Butter)
Ingredients
- 1 cup unsalted butter room temperature
- 1 cup creamy peanut butter room temperature
- 2 teaspoons pure vanilla extract
- 1 and 1/4 cups light brown sugar packed
- 1/3 cup granulated sugar
- 2 large eggs room temperature
- 1 large egg yolk room temperature
- 1 and 3/4 cups all-purpose flour
- 3/4 cup old-fashioned oats
- 1/2 cup quick oats
- 1 teaspoon baking soda
- 1 teaspoon baking powder
- 1/2 teaspoon ground cinnamon
- 1/2 teaspoon salt
- 1 and 1/2 cups M&M candies
- 1 and 1/2 cups semi-sweet chocolate chips
- 1/2 cup salted peanuts roughly chopped
Instructions
- Preheat your oven to 350°F (175°C). This step is crucial for achieving the perfect texture.
- In a large mixing bowl, combine the room temperature unsalted butter and creamy peanut butter. Using an electric mixer, beat them together until the mixture is smooth and creamy.
- Add the light brown sugar and granulated sugar to the bowl. Beat until well combined and fluffy. Then, mix in the pure vanilla extract for that extra flavor boost.
- Add the two large eggs and the additional egg yolk, one at a time, mixing well after each addition to ensure they are fully incorporated.
- In a separate bowl, whisk together the all-purpose flour, old-fashioned oats, quick oats, baking soda, baking powder, ground cinnamon, and salt. Gradually add this dry mixture to the wet ingredients, mixing until just combined.
- Gently fold in the M&M candies, semi-sweet chocolate chips, and chopped salted peanuts. This is where the "monster" in these cookies comes to life!
- Using a cookie scoop, portion out the dough onto prepared baking sheets lined with parchment paper. Leave enough space between each cookie for spreading.
- Bake the cookies in the preheated oven for about 10-12 minutes, or until the edges are lightly golden. The centers may look a bit underbaked, but they will continue to cook as they cool.
- Remove the baking sheets from the oven and let the cookies cool on them for about 5 minutes before transferring them to a cooling rack. Enjoy your chewy monster cookies warm or at room temperature!
Equipment
- Mixing Bowls
- Electric Mixer
- Baking Sheets
- Parchment Paper
- Cookie Scoop
- Cooling Rack
Notes
- For chewier cookies, chill the dough for at least 30 minutes before baking.
- Store cookies in an airtight container at room temperature for up to a week or freeze up to three months.
- Substitute M&M candies with chocolate chunks or use crunchy peanut butter for texture variations.

