Monster Cookies

By Polly Conner
April 7, 2020

This Monster Cookie recipe has been tucked away in my recipe stash for years. You’ll find that this cookie is easy to make and your people will gobble them up.

Monster cookies

My memory is a little fuzzy on where I originally got this recipe. I think I snagged it at my friend, Jeanna’s wedding shower many years ago. She might be scratching her head as she reads this and text me to tell me I’m cray. I blame the mom brain.

While I’d love to give proper credit to the originator of this recipe, Jesus knows who you are. I don’t. God bless you for sharing it with me so I can share it with the world.

Because guys, these cookies are good.

REAL good.

monster cookie on a cutting board

What’s in Monster Cookies?

What’s interesting to me about these Monster Cookies is that there is no flour in the recipe. Nada. Just a lot of oats, peanut butter, and sugar. Shocker, I know.

It’s a super simple recipe to make too. Just mix together all of the ingredients minus the chunky stuff.

monster cookie dough

What’s the chunky stuff I’m referring to? Oh you know, just all the things good in the world. See below.

m&ms and chocolate chips in a red bowl

After that, stir in 4 1/2 cups of old fashioned oats. Not a typo. Lots of oats. Probably why the recipe can get away with no flour.

Stir it up.

Try not to eat.

At least too much.

Think: 3 raw eggs in this mix.

As if that’s ever stopped me before.

Monster cookie cookie dough

I digress. 

Monster cookie cookie dough on a parchment lined baking sheet

I found that using a 1/4 measuring cup to scoop these out on a sheet was about right. Plop them on there and don’t worry about squishing them down. They’ll mellow out on their own. 

How Long do I Bake Monster Cookies?

Now here is the key to taking these to the next level. Only bake them for 10-12 minutes. At 12 minutes you are going to think, “These don’t look done. That blogger is wrong. I need to cook these longer.”

Wrong wrong wrong.

Take them out!

BUT. You must let them cool down at least 30 minutes. If you try too early, they will fall apart and you will send curses my way. Patience, my friend.

Monster cookies on a cutting board

How Long do Monster Cookies Last?

Another thing I love about these Monster cookies is that they don’t dry out very quickly. You know how most cookies the next day are just, meh. Not so with these beauties. They stay moist and will beckon to you night and day for a good 2 days.

Monster cookie broken in half

Good luck. 

Are Monster Cookies Gluten Free?

If you try to avoid gluten in your diet, here’s the good news: Monster Cookies have a great gluten free option!

The only ingredient has gluten is the oats. If you use gluten free oats, these cookies are gluten free!


Monster Cookies

  • Author: Thriving Home
  • Prep Time: 10 minutes
  • Cook Time: 12 minutes
  • Total Time: 22 minutes
  • Yield: 28 cookies 1x
  • Category: Dessert
  • Method: Bake
  • Cuisine: American


Monster Cookies are the all-in-one kind of cookies to bring happiness in every bite.


  • 1/2 cup butter (1 stick), softened
  • 1 1/2 cups peanut butter
  • 1 cup brown sugar
  • 1 cup white sugar
  • 2 teaspoons baking soda
  • 3 eggs
  • 2 teaspoons vanilla
  • 1 cup M&M’s
  • 1 cup chocolate chips
  • 4 1/2 cup old-fashioned oats (Quick oats will work in a pinch. For gluten free option: use gluten free oats.)


  1. Preheat the oven to 325°F and line two large baking sheets with parchment paper (or spray the sheet pans with cooking spray).
  2. In a large mixing bowl combine butter, peanut butter, brown sugar, white sugar, baking soda, eggs, and vanilla. Stir until well combined.
  3. Stir in the M&Ms, chocolate chips, and the oats.
  4. Using a 1/4 measuring cup to scoop dough onto lined baking sheets.
  5. Bake for 10-12 minutes (depending on size). They will appear a tad gooey but that’s ok!
  6. Let cookies cool for at least 30 minutes on baking sheets before removing them. 

Can I Freeze Monster Cookies?

If you find that this batch is much more than you wanted to make all at once, just freeze the dough using this tutorial. So easy!

Monster cookies

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6 replies
    • Rachel Tiemeyer says:

      We haven’t tested this recipe with a different nut butter, but I think you could do that consistency-wise. Almond butter may be too overpowering. Perhaps sunbutter or cashew butter would work better. We’d love to hear your results, if you try it.

  1. MArie Flatau says:

    Whoo-wee these are sweet! I have made them twice. I made them once with 1/2 coconut sugar and loved them. 2 cups of can sugar was way too sweet for me and I love my sweets! These make a lot but would be fun for a party of to have on hand to give to a guest, neighbor, etc.