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August 13, 2012

Recipe for Monster Cookies

Recipe for Monster Cookies.  Oatmeal. Chocolate Chips. M&Ms. Peanut Butter. #cookies #dessert
I’m headed to a family reunion today and these are what I’m bringing.  A massive batch of monster cookies.  I know this isn’t a slow cooker recipe but this is one of my favorite cookies (and cookie doughs) of ALL time.  It does make A LOT though, so you may want to halve the recipe.
6 eggs
2 1/4 cups brown sugar
2 cups white sugar
1 1/2 tsp vanilla
1 1/2 tsp Karo syrup
1/2 tsp salt
4 tsp soda
2 sticks of butter (at room temperature)
3 cups peanut butter
9 cups quick oats
1 (12 oz) bag semi-sweet chocolate chips
1 (12 oz) bag M&Ms (I used minis for this batch)

1.  Add all ingredients to a super large bowl and mix until well combined.
2.  Drop by spoonful onto a cookie sheet that has been sprayed with non-stick cooking spray.
3.  Cook in a preheated oven at 350 for about 9-10 minutes (do not overcook!)
These cookies freeze well.  Also, they are very addictive.

22 Comments Filed Under: All Recipes, Desserts, Other Methods Tagged With: slow cooker recipes, 5 stars, All Posts, non slow cooker recipes, crock pot recipes, recipes crock pot

Comments

  1. Emily S says

    March 11, 2026 at 7:37 pm

    Karen,

    ……. Just. Wow.
    I’m allergic to peanut butter and by allergic I mean intolerant and my husband pays the price later…
    I made these cookies (a massive batch btw) a few months ago and have felt the yearning returning.
    It won’t be long now and my husband will be paying the price again.

    If I haven’t made myself clear, these are the best and easiest cookies I’ve ever had the pleasure of eating and baking.

    You’re a national treasure, Karen. Please keep using your American freedom for good and holy things… even if these cookies feel like sin.

    God bless!

    Reply
    • Karen says

      March 12, 2026 at 1:45 pm

      Well this might be the best cookie review I’ve ever received! thank you! I’m thrilled you loved them so much, and I appreciate the very generous “national treasure” title 😄

      Reply
  2. Amanda says

    September 6, 2025 at 2:57 pm

    Hi! Can’t wait to try these. I have everything on hand except the Karo. Can I leave it out or substitute? Thanks!

    Reply
    • Karen says

      September 6, 2025 at 6:44 pm

      I would just leave it out or use honey or maple syrup in its place.

      Reply
  3. Brian says

    September 6, 2025 at 9:24 am

    What kind of pean̈ut butter do you use? I only have natural PB with no salt or sugar just peanuts and have been told it n ot good for cookies or any other baking.

    Reply
    • Karen says

      September 6, 2025 at 6:43 pm

      I bet you’re right. I just use Jif or Skippy.

      Reply
  4. Jason says

    September 3, 2025 at 3:49 am

    These look delicious! The recipe calls for “4 tsp soda” I’m assuming it’s baking soda?
    Thank you

    Reply
    • Karen says

      September 4, 2025 at 1:24 pm

      yes, that’s right. that’s how my mom used to write recipes that calls for baking soda.

      Reply
  5. Helen L. Kimes says

    September 1, 2025 at 9:29 am

    Love to try your recipe, but can’t stomach using karo syrup. Have you ever tried using another substitute? Thank you

    Reply
    • Karen says

      September 1, 2025 at 2:49 pm

      I would just leave it out. The fact that it is only 1.5 teaspoons makes me wonder why it is even in the recipe in the first place.

      Reply
      • Helen L. Kimes says

        September 1, 2025 at 3:18 pm

        Oh gosh, my mistake. Since it makes a large amount of cookie dough, I was thinking cups!! Sorry. Look forward to making these 😊

        Reply
  6. Royal Williams says

    August 31, 2025 at 7:54 pm

    I have not made these. But if I am reading this correctly these are gluten free. I hope these are amazing. Wheat allergy is a horrible thing.

    Reply
    • Karen says

      September 1, 2025 at 2:50 pm

      Yes, if you use certified gluten free oatmeal this is a gluten free recipe!

      Reply
  7. Claire M says

    August 31, 2025 at 5:09 pm

    Have you ever tried old fashioned oats instead of the quick oats?

    Reply
    • Karen says

      September 1, 2025 at 2:53 pm

      I have not. However you could probably use them but I would pulse them in a blender a few times to mimic the quick oats texture.

      Reply
      • Claire says

        September 1, 2025 at 10:19 pm

        Thanks!

        Reply
  8. Randee says

    December 24, 2019 at 3:59 pm

    Best cookies, easiest recipe! I’m to the point where I’m making a batch of these every three or four weeks and freezing the portioned dough so I always have cookies on hand. Thank you!!

    Reply
    • Karen says

      December 26, 2019 at 5:21 pm

      Yum! I love doing that.

      Reply
  9. Cookie Monster says

    April 28, 2018 at 8:24 am

    Me love COOOOKIES!!!
    A mister cookie with one bite out of it looks like a ‘C’.
    Nmmm naam naam nammm!!!!!

    Reply
    • Karen says

      April 30, 2018 at 10:40 am

      me love cookies too!!! We are alike.

      Reply
  10. Susan Vilar says

    August 19, 2012 at 6:27 pm

    Hey Karen,

    We used to make these as well… dropped by 1/4 or 1/3 cupfulls… they were 2 – 3 on a cookie sheet, and HUGE! TOO much fun!!
    Hope they loved 'em!!

    Reply
  11. Vicki says

    August 16, 2012 at 1:16 am

    These are so yummy! And it is a great way to use up some of my old peanut butter. Thanks!

    Reply

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Hi, I’m Karen. I know that dinner time can be less than relaxing. Busy schedules and cranky kids and a hundred other things can lead to weariness when it comes to putting dinner on the table. I can help! I make homemade, family-friendly slow cooker and Instant Pot dinners and share the recipes with you.

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