Soft Batch Monster Cookies are a cross between a soft peanut butter cookie and an oatmeal cookie that is loaded with peanut butter, oats, M&M’s, and chocolate chips. If these cookies sound good to you, you will love my Giant Monster Cookies, too!

Stack of Soft Batch Monster Cookies
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Soft Batch Monster Cookies

These monster cookies are soft and chewy cookies that are the perfect blend of peanut butter and chocolate in every bite. If you love soft batch cookies, this is the perfect recipe for you. M&M candies and chocolate chips are folded into the cookie dough, and mini M&M’s are a wonderful addition to the tops of the cookies.

Overhead Tray of Soft Batch Monster Cookies

Soft Batch Monster Cookies Ingredients

Room Temperature Ingredients: Using room temperature ingredients (butter, eggs, and peanut butter) will help you get the best results when baking these soft-batch monster cookies. Butter is at room temperature at 65°F.

Accurate Measuring: Always use dry measuring cups for ingredients like flour and sugar. This allows you to level off the surface to get a more accurate amount. If possible, dip the measuring cup into the ingredient and level it with a straight-edged object.

Oats: I used old-fashioned oats in this recipe. You could also use quick oats in a pinch.

Adding M&M’s and Chocolate Chips: When adding solid ingredients (like these candy-coated chocolates and chips), I prefer to stir them in by hand. If you are using your mixer, mix them in on low for only about 5 seconds.

Stacked Soft Batch Monster Cookies

Do I Have to Chill the Dough?

It really is important to chill the cookie dough, and it does make a difference in the end result. When you chill cookie dough, it solidifies the fat. Then, when you are ready to bake the cookies, the chilled dough takes longer to melt and remains solid longer, meaning the cookies spread less.

Chilling the dough also makes the cookies more flavorful. The dry ingredients have time to soak up the wet ingredients, allowing them all to come together. In addition, baking will be a lot more even.

Yes! Most cookie doughs are great for freezing. To freeze the dough, scoop the batter onto parchment paper-lined baking sheets. Place the dough balls in the freezer for 1-2 hours. After the dough is completely frozen, store them in a freezer-safe zipper bag until ready to bake. To bake from frozen, simply add a couple of minutes to the baking time.

M&M Soft Batch Monster Cookies

More Peanut Butter Cookies

5 from 2 votes

Soft Batch Monster Cookies

Prep Time 15 minutes
Cook Time 10 minutes
Chill 30 minutes
Total Time 55 minutes
Soft Batch Monster Cookies are a cross between a soft peanut butter cookie and an oatmeal cookie that is loaded with peanut butter, oats, M&M's, and chocolate chips.


  • 1 cup (2 sticks / 227 g) unsalted butter, room temperature
  • 1 cup (258 g) creamy peanut butter
  • 1 ½ cups (300 g) light brown sugar, packed
  • 2 large eggs, room temperature
  • 2 cups (250 g) all-purpose flour
  • 1 cup (90 g) old fashioned oats
  • 1 teaspoon baking soda
  • ½ teaspoon kosher salt
  • 1 ½ cups M&M candies
  • 1 ½ cups (252 g) semi-sweet chocolate chips
  • mini M&M candies, for topping (optional)


  • Line baking sheets with parchment paper. Set aside.
  • In the bowl of a stand mixer with a paddle attachment (or a handheld mixer), beat the butter on medium-high speed until smooth (about a minute).
  • Add the peanut butter; beat for about 2 minutes, or until smooth.
  • Add brown sugar and cream on medium-high speed until smooth (about 2 minutes).
  • Add eggs, one at a time, mixing for 30 seconds after each addition. Scrape down the sides of the bowl and beat ingredients together again, if necessary.
  • With the mixer off, add the flour, oats, baking soda, and salt. Mix on low until just combined, being careful not to overmix.
  • With the mixer still on low (or by hand), add the M&M's and chocolate chips and mix until incorporated. (If using an electric mixer, only mix for a few seconds.)
  • Drop spoonfuls (2-3 tablespoons) of dough onto the lined baking sheets about 2 inches apart. (If possible, measure the batter so the cookies are all the same size for best results when baking.) Top with mini m&m's (optional).
  • Place the baking sheets of unbaked cookies into the refrigerator to chill for about 30 minutes. (If letting the dough chill overnight, be sure to cover.)
  • When ready, preheat the oven to 350°F. Remove the cookies from the refrigerator.
  • Bake the cookies for 10 minutes. The cookies are done when the sides are lightly browned and the centers still look soft.
  • Remove from the oven and let cookies cool on the baking sheet for a few minutes before transferring to a wire rack to finish cooling.


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Meet Amanda Rettke

Amanda Rettke is the creator of I Am Baker, and the bestselling author of Surprise Inside Cakes: Amazing Cakes for Every Occasion – With a Little Something Extra Inside.Over the course of her 15+ year blogging adventure, she has been featured in and collaborated with the Food Network, New York Times, LA Times, Country Living Magazine, People Magazine, Epicurious, Brides, Romantic Homes, life:beautiful, Publishers Weekly, The Daily Mail, Star Tribune, The Globe and Mail, DailyCandy, YumSugar, The Knot, The Kitchn, and Parade, to name a few.

Reader Comments

  1. Hi! Would I need to change the baking time if I’m using quick oats instead of old fashioned? Thanks! Love all of your recipes!

  2. I have the original monster cookie recipe. It was made in the 1930’s by the CCC’s (civilian conservation corps) in the depression era. The monster name came from the size of the recipe, not the size of the cookie. It has 12 eggs, 2lbs brown sugar, 4 cups white sugar, 1 tbs vanilla, 1 tbs Karo, 8 tsp soda, 1 lb butter or margarine, 3 lbs chunky peanut butter. Mix in a very large bread bowl. Add 18 cups of rolled oatmeal. Add 1 lb M&M’s and 12 oz chocolate chips. There is NO flour. I expect the candy was a later embellishment. My 92 year old husband’s aunts got the recipe when their husbands were in the CCC’s.

  3. I have made these SOOOOO many times & we’ve always loved them but today I added a “twist” and it was really good. Not to replace the original but just a fun additional I had on hand & wanted to use up. We get the big container of peanut butter filled pretzel “puffs” from Costco so I crushed them in a bag & added about a cup+ and it was 😋 yummy.
    Thank you for your “care” and geniune thoughtfulness that you share with all of us ~ it is so greatly appreciated and ENJOYED❗️❗️❗️ Linda

  4. These are going to be my go-to M&M cookies from now on! I made these for a dessert potluck and they turned out fantastic! A very easy recipe to follow, and the result was a delicious, soft cookie with so many yummy flavors. I’ve kept the leftovers in an airtight container and they stayed soft through the week. Also, I can’t believe I’ve never thought to pre-portion the dough BEFORE chilling! GENIUS! Thank you for an amazing recipe and a fantastic tip!

  5. These cookies are incredible and everyone loves them! Thank you for this recipe.

    I do wonder though… do you ever look at your own website/recipes? The amount of ads, pop-ups, videos, etc. make your website a nightmare to use. I’m noticing this terrible trend on recipe sites and it is very user unfriendly.

    1. Hi KA – I switched ad companies 3 days ago – so right now is kind of a tough time as its a long process to go through. I have always tried to make sure that I have the least amount of ads on my site and am still able to earn income and I do plan on trying to reduce once the dust settles. I’m sorry if it is annoying!

  6. Great recipe! I made these for Father’s Day and they were delicious.
    Side note: they now make peanut butter mini M&M’s 😋
    I put them in the batter and on top of the cookies. Yummy

  7. These cookies are so delicious! I’ve made them twice now and they always turn out perfect.
    I have a question can I freeze the cookies once I’ve baked them?

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