Monster Cookies combine many of the best cookies into one! They’re soft and chewy, with peanut butter, oatmeal, milk chocolate candies, and chocolate chips for a delicious treat.

If you’ve ever wanted “everything” in one cookie, then Monster cookies are for you.

Monster Cookies on Blue Plate with M&Ms

The texture has bits of everything you could want: crisp on the edges, but a bit chewy as your teeth sink into it, plus bits of oatmeal for a hearty bite, and melty chocolate candies.

And then the flavor: there’s creamy peanut butter, the subtle flavor of molasses from the brown sugar, some hints of chocolate chip cookie with two kinds of chocolate, and slightly sweet oatmeal.

You’d think it’d be too “busy” for all of that to be going on, but it’s not. The same goes for the combination of chocolate AND oatmeal in The Very Best Oatmeal Chocolate Chip Cookies. It all works to create something that I view as an ultimate cookie.

Monster Cookies Recipe Presented on Blue Plate with M&Ms

The beauty of a monster cookie is you can do different types of mix-ins for it.

In the past I’ve done toffee bits, peanut butter chips, raisins, cranberries, and nuts. You can play with it to suit your tastes, or what you happen to have in your pantry.

Close Up Of Chocolate Candies Monster Cookie

One more thing I want to mention is that this recipe has been updated from when I originally published it in 2011. After several batches of testing, the most drastic change was decreasing the amount of oats and adding a small amount of flour to ultimately give it a more standard cookie texture, like that of a chocolate chip cookie.

You still get the oats in each bite, but I think this updated recipe is much better than the original. But the original, which is flour and gluten-free, is still pasted at the bottom if you prefer that.

Okay, let’s bake!

How to Make Them:

In a bowl, combine a stick of softened butter along with brown sugar and granulated sugar:

Brown Sugar, Sugar, and Butter in Glass Bowl

Using brown sugar in addition to the regular will give the cookie a slightly chewy texture that is heavenly!

Cream the butter and sugars together, then add creamy peanut butter, an egg, vanilla extract, and salt:

Creamed Butter and Sugar, Peanut Butter, and Egg in Bowl

Cream that together to combine, then add the dry ingredients (flour and baking soda):

Adding Flour to Wet Ingredients in Bowl

When the dry ingredients are almost mixed in, add some oats, chocolate chips, and chocolate candies:

oats, Chocolate Chips, and Chocolate Candies Added to Dough Bowl

You can do other mix-ins here too, like nuts, dried fruits, toffee bits, and more.

Also, for the oats, you want to make sure you’re using quick oats or slightly cut up old fashioned oats. Quick oats are better, but I usually only keep old-fashioned on hand. Simple pulse them in a food processor a few times to break them down slightly.

Stir everything together to distribute the ingredients, and to ensure all the flour is mixed in:

Monster Cookie Dough in Glass Bowl

Use a cookie scoop to portion out large scoops of cookie dough onto a silicone mat or parchment lined baking sheet:

Scoops of Monster Cookie Dough on Silicone Mat

If you want to freeze your monster cookies: Freeze the scoops of cookie dough for up to two months. When ready to bake, bake straight from frozen at the same temperature, but adding a few minutes to baking time.

If desired, you can press a few extra chocolate candies into the outside of the cookie:

Pressing Chocolate Candies into Monster Cookie Dough Balls

It’s only for the sake of looks, if you want to have whole pieces of candy on the outside, but it’s not necessary otherwise.

Bake the cookies until they’re slightly golden on the edges, but soft in the middle, about 11 minutes.

Baked Monster Cookies on Silicone Mat

Enjoy warm with a glass of milk!

Monster Cookies will last for about 3 days at room temperature, or you can freeze them after they’ve been baked, for up to 2 months.

Similar cookies I love are these Peanut Butter M&M Cookies, Potato Chip Chocolate Chip Cookies, and White & Dark Chocolate Chunk Cookies.

You can see all of my cookie recipes in my Cookie Recipes section of my Recipe Index. Happy baking!

Monster Cookies on Blue Plate with M&Ms

Monster Cookies

Monster Cookies combine many of the best cookies all into one! They're soft and chewy, with peanut butter, oatmeal, milk chocolate candies, and chocolate chips for a delicious treat.

Leave a Review »


  • 1/2 cup unsalted butter softened
  • 1/2 cup packed brown sugar
  • 1/2 cup sugar
  • 1/2 cup creamy peanut butter*
  • 1 large egg
  • 1/2 tsp vanilla extract
  • 1/4 tsp salt
  • 3/4 cup all-purpose flour (3.75 ounces, by weight)
  • 1/2 tsp baking soda
  • 1/2 cup semisweet chocolate chips
  • 1/2 cup chocolate candies
  • 1/2 cup quick cooking oats**


  • Preheat the oven to 350 degrees F.
  • In a large bowl, cream together the butter, brown sugar, and sugar, for about a minute, until well combined.
  • Add the peanut butter, egg, vanilla extract, and salt, and mix until smooth and combined.
  • Add the flour and baking soda, and mix until the flour has almost disappeared.
  • Add the chocolate chips, chocolate candies, and oats, and mix until evenly distributed and the flour has been incorporated. Do not overmix. 
  • Use a #20 3T large cookie scoop to portion scoops out on a silicone mat lined or parchment paper lined baking sheet, 9 per half sheet pan (you will have two trays).
  • Bake for 11-13 minutes, until the cookies are slightly golden on the edges, but still soft in the middle. You want to pull them just before they seem done, as they will continue to cook on the sheet pan as they cool.
  • Let them cool on the pan, and you can enjoy them slightly warm or after they've cooled. Enjoy! 


 *I use the creamy, spreadable peanut butter. Not the one with hydrogenated oil in it, but the ones where a touch of extra oil is added to give it a smooth texture. My guess is natural peanut butter would work just fine here too.
**If you don't have quick cooking oats, you can pulse old fashioned oats in a food processor several times to cut them into smaller pieces.


Calories: 222kcal, Carbohydrates: 27g, Protein: 4g, Fat: 12g, Saturated Fat: 6g, Cholesterol: 25mg, Sodium: 109mg, Fiber: 1g, Sugar: 18g

Nutrition is estimated using a food database and is only intended to be used as a guideline for informational purposes.

Note: this post and recipe was updated in June 2018, and it was originally published September 2011.