Monster Cookie Bars

What better way to show a loved one you care this Valentine’s Day than with a plate full of amazing Monster Cookie Bars?!

Monster Cookie Bars are one of my most popular recipes. Everyone that’s tried them has loved them. They are soft, chocolatey and go great with a glass of milk. Often times my husband will eat one for breakfast and use the excuse that they have oatmeal in them so it’s like a breakfast bar. Hey, you do you, no judgement here.

What I love about these bars is they are way easier than Monster Cookies, so amazingly delicious and the M&Ms can be switched around for different occasions. Here’s just a few ideas:
Red white and pink – Valentine’s Day
Red white and blue – 4th of July
Red and green – Christmas
All the colors – Every. Single. Day. Because who needs an excuse to eat something so delicious?

Here’s what I did for my son’s 3rd birthday party which was a superhero theme. If you know me you know I like to have the theme stretch across all aspects of the party, including the food. So I used red white and blue M&Ms and made Captain America’s Power Bars. Cute, right?


On to the recipe! For this recipe you’ll use a lot of basics that you’ll likely have in your pantry already. Oftentimes the only thing I need to buy is the M&Ms. (they don’t last long around here)


Start by mixing together your sugars and butter until they are creamy. From there add in eggs, one at a time, mixing in between each addition. Then add in the baking soda. From there add in your peanut butter and mix it until you have a smooth texture.


While we’re on the subject of peanut butter, I have a request for anyone who has a connection to peanut butter companies. Can someone PLEASE create pre-measured peanut butter in squeeze bags? I use peanut butter a lot in my baking and I despise having to reach my spoon in the jar and getting peanut butter on my hand, then getting it in my measuring cup and having to wash the greasy mess. Just gross. So how about peanut butter by the half cup in bags so we can just squeeze into our mixing bowls and throw away the bag. No mess, no stickyness, just a happy baker. Ball is in your court peanut butter companies. I’ll be waiting.

Back to the recipe! After the peanut butter, mix in the oatmeal 1 cup at a time, mixing briefly in between additions. Then add in your chocolate chips and M&Ms and mix those in by hand.

I feel like the M&M guy is saying “yeah gurl, you pour those M&Ms in and lets make some magic” Like a 50 Shades of Grey but instead it’s 50 Shades of M&Ms. Much tastier.

Once you have all your candies mixed in, prepare a 9×13 pan by greasing it well. Pour the mixture into your prepared pan. Bake at 350 degrees for 20-25 minutes. Oven temperatures and times vary, so always best to do the lower end of time and check every couple minutes until it looks good to you. Once you’ve made them a couple times you’ll find what timing works best for you.

That’s it! Now let them set for just a bit and once you can’t wait anymore cut into those bad boys and enjoy every single bite. Then if there are any left, maybe give one to your Valentine. I have 5 Valentines so think I’ll need to make a couple batches just so I get some. Happy Valentine’s Day! ❤

Don’t forget to have a little fun today!

Monster Cookie Bars



  • 1/2 cup of salted butter
  • 1 cup Granulated Sugar
  • 1 cup Brown Sugar
  • 3 eggs
  • 2 tsp Baking Soda
  • 1 1/2 cups Creamy Peanut Butter
  • 4 1/2 cups Oatmeal (quick cooking)
  • 1 package Milk Chocolate Chips
  • 1 package M&Ms


  1. Combine butter and sugars, mix until creamy
  2. Add eggs, one at a time, mixing after each addition
  3. Add in baking soda
  4. Blend in peanut butter, mix until smooth texture forms
  5. Mix in oatmeal, 1 cup at a time, mix briefly after each cup
  6. Pour in chocolate chips and M&Ms, mix by hand
  7. Spread mixture into a greased 9×13 baking dish
  8. Bake at 350 degrees for 20-25 minutes.
  9. Store in airtight container

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