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Grandma’s Monster Cookies

Super thick and chewy oatmeal peanut butter cookies with M&Ms and melty chocolate chips.

 

**This recipe was originally published in 2015 in my 12 days of Christmas series! But since I love these cookies so much, I thought I’d share them again now. Enjoy!

Hearty peanut butter and oat cookies loaded with M&M's and chocolate chips

12 Days of Christmas Cookies

Recipe 10! Wowza. We’re almost all the way through the 12 Days of Christmas Cookies. And you know what? I’m not even tired of cookies yet! Are you?

Of course not. Such a silly question 😂.

Hearty peanut butter and oat cookies loaded with M&M's and chocolate chips

I’ve actually published this recipe on my blog before way back when. But this Christmas Cookie series just wouldn’t be the same without my Grandma’s monster cookies making an appearance. And they needed a little makeover anyway. Red and greed look good on these cookies, don’tcha think?

My Grandma has been making this monster cookie recipe for our holidays ever since I can remember, and this is my all time favorite recipe. I’ve never eaten a chewier, more peanut butter-y monster cookie than these.

In my book, it is truly a perfect recipe!

Hearty peanut butter and oat cookies loaded with M&M's and chocolate chips

The only change I’ve made from my grandmother’s original recipe is that I’ve pared it down quite a bit. Her recipe makes about 8 dozen cookies (8 DOZEN!!! 😳). I quartered it, so that you’ll get a “heavy” 2 dozen out of this version.

Believe it or not, even pared down, we’ve managed to stuff an ENTIRE bag of M&MS and and entire bag of chocolate chips into this recipe! And this hearty peanut butter and oatmeal dough really holds up to the task.

Ok. So this recipe is smaller and more manageable, it’s chewy and full of chocolate, one more thing…

This recipe is actually my favorite kind of cookie recipe: EASY. You don’t have to chill the dough and there’s no special trick to mix it up. Just mix the ingredients (in one bowl), scoop, and bake!

Hearty peanut butter and oat cookies loaded with M&M's and chocolate chips

This is one of those recipes that is truly near and dear to my heart, and I know it will find it way into yours! I think it’s the best cookie in the entire world. Enjoy :)

Monster Cookies

Super thick and chewy oatmeal peanut butter cookies with M&Ms and melty chocolate chips.

Ingredients:

1/2 c. butter, softened

1-1/2 c. peanut butter

1 c. brown sugar

1 c. sugar

3 eggs

1 tbsp. corn syrup

1 tsp. vanilla

2 tsp. baking soda

4-1/2 c. old fashioned oats

1/4 tsp. salt

1 package plain M&Ms

2 c. semi sweet chocolate chips

Directions:

Preheat the oven to 350 degrees F.

Beat together the peanut butter and butter until smooth and combined.

Beat in the brown sugar and granulated sugar.

Add the eggs, one at a time, and mix in between each addition.

Mix in the corn syrup and vanilla.

Mix in the baking soda, oats, and salt. Fold in the M&Ms and chocolate chips. The dough will be sticky, but that's okay!

Scoop cookie dough (about 2tbsp scoops) onto a parchment or silicone lined baking sheet. Bake for 9 minutes, until the edges look set and golden, but the top is not brown.

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Hearty peanut butter and oat cookies loaded with M&M's and chocolate chips

Are you an oatmeal cookie lover?

Then you MUST try these recipes next:

Cowboy Cookies

Cowboy Cookies

M&M Oatmeal Chocolate Chip Cookies

M&M Oatmeal Chocolate Chip Cookies

Doubletree Hotel Chocolate Chip Cookies

Doubletree Hotel Chocolate Chip Cookies

Ashton Swank

Ashton is the owner and author of Something Swanky. Although first and foremost a wife and mother, she considers herself an online entrepreneur, freelance writer and photographer, and brand ambassador. Her focus is in food styling, food photography and recipe development.