My most popular recipe! Classic monster cookies loaded with peanut butter, oats, chocolate chips, m&m’s. These no flour monster cookie bars bake in a cookie sheet and are the most delicious cookie bars you’ll ever have. Plus, there is NO FLOUR in these!
updated with new video and image April 2018
I first posted these no flour monster cookie bars in August of 2015. Since then they have been viewed over 1 million (and counting…) times on the blog! I remember when I posted these, the first time, I did not think they would be loved by all and the most popular recipe on the blog.
It truly makes me so happy that everyone is loving these bars. I decided, because I feel like I make them all the time anyways, that they deserved a re-do post and new updated pictures.
A simple mixture of butter, peanut butter, oats, chocolate chips, and m&m’s. Mixes up in one bowl and then bakes in a cookie sheet, which makes them perfect for a large group.
Or after baking wrap them up individually and freeze them. Eat them cold (really yummy!) or put one in a lunch box and it will be thawed by lunchtime. You can also warm it up in the microwave for 10-15 seconds. Either way, I know you’ll love them.
I have had several readers tell me that they have reduced the sugars, by as much as half, and they still turned out really well. I have personally never done that so I can’t say for sure how the recipe turns out with reduced sugar.
Keep in mind that the recipe makes an entire cookie sheet so 2 cups of sugar is spread out among roughly 30-36 servings.
Also, substitute in whatever you want. Butterscotch chips, white chocolate chips, peanut butter chips, pecans, etc. Just try to keep at the 2-3 cups of mix-ins.
Let me know if you’ve made these and how you like them! The original post has over a hundred comments and they are rave reviews. Thank you to all that have made these, shared these on Facebook, and pinned them to Pinterest ♥ ♥
Thank you for visiting for this recipe. I truly hope you love these as much as my family does.
Watch the video below to see how to make these bars!
- 1/2 cup salted butter, softened 1 stick
- 1 cup packed brown sugar
- 1 cup granulated sugar
- 1 1/2 cups creamy peanut butter
- 3 large eggs
- 1 tablespoon vanilla extract
- 1 1/2 cups quick oats
- 3 cups old-fashioned oats
- 1 teaspoon baking soda
- 1 1/2 cups mini m&m's
- 1 cup miniature chocolate chips
Heat oven to 350 degrees. Prepare a cookie sheet by lining with parchment paper, silpat liner, or spraying with cooking spray.
In a large bowl, or bowl of stand mixer with the paddle attachment, combine butter, brown sugar, granulated sugar, and peanut butter. Mix until fluffy and pale in color. About 1-2 minutes.
Add the eggs and vanilla extract. Mix together.
Add in the oats and baking soda. Mix until combined.
Add in the m&m's and chocolate chips (reserve some for top of bars if wanted). Stir together with a wooden spoon or spatula until combined.
Dump dough onto the cookie sheet and spread out. This will take several minutes, but it can be done. Sprinkle the reserved m&m's and chocolate chips on top (if wanted). Press down slightly into dough.
Bake for 17-20 minutes. The edges will be lightly browned and the middle will still look pale and underdone, but it will finish baking as it cools. Let cool for at least an hour so the bars can firm up and come together. You do not want to over-bake these!
Use a pizza cutter to cut these. Makes it so easy. To make spreading the dough in the cookie sheet easier; spray hands with cooking spray and press out, use a spatula to spread, or use the butter wrapper to spread it out in the cookie sheet. The bag (about 10 oz) of mini m&m's comes with about 1 1/2 cups of m&m's inside of it. I just use the whole bag. It's less than the 2 cups called for. So, use 1-2 cups of the m&m's. Whatever you prefer. These need to cool for an hour so they can set and come together. You can eat them warm and gooey, but to make cutting easy and so they'll hold up, let them cool completely. When they come out of the oven they will look gooey but I promise they will come together as they cool.
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