Soft and Chewy Monster Cookies – Deliciously thick, soft and chewy peanut butter cookies stuffed full of oats, M&Ms, and chocolate chips!
Monster cookies are peanut butter cookies that have oats, M&Ms, and chocolate chips in them. Basically ALL my favourite cookie add-ins. Today I bring you my recipe for Monster Cookies.
They are super thick, soft, and chewy, and stuffed full of those delicious add-ins – just how they should be.
These cookies are so quick and easy to throw together and bake. No mixer required, and no chilling of the dough – just mix and bake!
How to make Soft and Chewy Monster Cookies
Ingredients you’ll need:
- plain/all-purpose flour
- porridge oats
- baking powder
- baking soda
- salt
- unsalted butter
- caster/granulated sugar
- light or dark brown sugar
- large egg
- vanilla extract
- smooth peanut butter
- chocolate M&M’s
- chocolate chips
To make these cookies, simply whisk together the flour, oats, baking powder, baking soda, and salt. Set aside.
In a separate bowl, whisk together the butter and sugars until combined. Add the egg, vanilla, and peanut butter, and mix until combined.
Add the dry ingredients and mix until just combined, then fold in the M&Ms and chocolate chips.
Roll the dough into 1.5oz balls, place onto a baking tray lined with parchment paper or a silicone mat, and bake for 8 – 10 minutes. The cookies will be very soft, but will firm up as they cool.
Allow to cool on the baking tray for 5 – 10 minutes before transferring them to a wire rack to cool completely.
The printable recipe card with the full list of ingredients, their measurements, and instructions can be found at the bottom of this post.
NOTE: For best results, I highly recommend using the gram measurements (with a digital scale), rather than the cup measurements. Cup measurements are simply not accurate enough, and I cannot guarantee the best results if you use them.
These Soft and Chewy Monster Cookies are:
- super quick and easy to make
- loaded with peanut butter flavour
- stuffed FULL of M&M’s and chocolate chips
How long will these Monster Cookies last? These cookies stay fresh kept in an airtight container, at room temperature for up to 1 week.
For freshly-baked cookies every time, you can keep the cookie dough balls in the fridge for up to 5 days, or in the freezer for up to 3 months. Bake straight from frozen!
Tried this recipe?
If you try this recipe, let us know! Leave a comment, rate it, and don’t forget to tag me on Instagram and hashtag it #simplybakeblog. I’d love to see!
Try these delicious cookies next!
- 4-Ingredient Peanut Butter Cookies
- Chocolate Orange Slice ‘n’ Bake Cookies
- Vegan Chocolate Chip Cookies
- Russian Tea Cakes
Craving more sweet treats? Subscribe to my newsletter to receive recipe updates straight to your inbox. You can also keep up to date on Facebook, Pinterest, and Instagram.
Soft and Chewy Monster Cookies
Ingredients
- 1 ½ cups (190g) plain/all-purpose flour
- 1 cup (90g) porridge oats
- 1 teaspoon baking powder
- ½ teaspoon baking soda
- ¼ teaspoon salt
- ½ cup (115g) unsalted butter, melted
- ½ cup (100g) caster/granulated sugar
- ¼ cup (50g) light brown sugar
- 1 large egg
- 2 teaspoons vanilla extract
- ½ cup (125g) smooth peanut butter
- ¾ cup (150g) chocolate M&Ms
- ½ cup (90g) chocolate chips
Instructions
- Preheat the oven to 180C/350F/Gas 4, and line a baking tray with parchment paper, or a silicone mat. Set aside.
- Whisk together the flour, oats, baking powder, baking soda, and salt. Set aside.
- Whisk together the butter and sugars until combined. Add the egg, vanilla, and peanut butter, and mix until combined. Add the dry ingredients, and mix until just combined. Fold in the M&Ms and chocolate chips.
- Roll the dough into 1.5oz balls, place on the prepared baking tray, and bake for 8 – 10 minutes until barely browned around the edges. They will be very soft, but will firm up as they cool.
- Allow to cool on the baking tray for 5 – 10 minutes before transferring to a wire rack to cool completely.
Recipe Notes
Nutrition Information:
Nutrition information is automatically calculated, so should only be used as an approximation.
What are porridge oats? Here in the States, it’s either quick cooking or old fashioned (rolled) oats? Thank you!
Porridge oats will be the quick oats. Although, if you prefer, you can use rolled oats instead.
These look so delicious! I am a sucker for m&m cookies! Pinning for later and following your accounts 🙂
These cookies look incredible, Marsha! But of course, everything you make looks wonderful. 🙂 I’m thinking my nephew would love to go for an entire stack of these! Pinned, of course. Wishing you an awesome weekend ahead!
Thanks, Demeter! You too!