Monster Cookie Bars are so easy to make, and full of delicious flavor. Such a fun treat to bake with the kiddos!
These are the bar version of my Monster Cookies. Cookie Bars are a great recipe for a first time baker. You can get things a little bit wrong (too much flour, not soft enough butter, etc) and still end up with a great dessert. Most cookie recipes that follow a 1 inch dough ball and yield around 30 cookies can be baked in a 9 by 13 inch pan for about 25 to 30 minutes.
What are Monster Bars
The reason for the name Monster Cookies, or in this case Monster Bars, is because we are taking every kind of cookie and combining them. They are a hodge podge wonder dessert! These cookies contain:
- M&Ms
- Oatmeal
- Chocolate Chips
- Peanut Butter
Baking Tips and Tricks
Though cookie bars are very forgiving, I think they still present a great opportunity to teach our kiddos baking basics.
- Measure the flour correctly. Your best bet is to weight the flour, but if you don’t have a kitchen scale, you will want to scoop it with a spoon into a dry measuring cup. Read all about this here: How to Measure Flour.
- Cream the butter and sugar together well. Beating them together helps add air to the butter, which yields light and fluffy cookies. Make sure you beat them together for about 3 to 6 minutes.
- Use fresh ingredients. Fresh baking soda and baking powder are critical to baking. Each needs to be replaced about every six months. You can test their freshness by dropping baking soda in a little vinegar or baking powder in a little water. They should bubble immediately.
Storing and Freezing
After allowing the bars to cool completely, store them in an airtight container for up to 1 week.
Alternatively, freeze on a parchment lined baking sheet for 1 hour and then transfer to an airtight container. Freeze for up to three months.
These are actually incredibly delicious right from the freezer.
Other Great Cookie Bars
If you can’t get over cookie bar recipes, make these with the kids!
If you love these cookie bars or make others, please leave me a comment and let me know what you think!
Monster Cookie Bars
Ingredients
- 1 cup all purpose flour see note 1 (120 grams)
- 1/2 teaspoon baking soda
- 1/2 teaspoon baking powder
- 1/4 teaspoon salt
- 1 cup unsalted butter room temperature (226 grams)
- 1 cup brown sugar packed (213 grams)
- 1/2 cup granulated sugar (198 grams)
- 1 1/2 cups creamy peanut butter (405 grams)
- 2 large eggs room temperature
- 2 teaspoons vanilla extract
- 1 cup milk chocolate chips (170 grams)
- 1 cup M&Ms (170 grams)
- 1 cup quick cooking oats or old fashioned, see note 2 (89 grams)
Instructions
- Preheat your oven to 350 degrees Fahrenheit. Spray a 9 by 13 inch baking dish with cooking spray and set aside.
- In a medium sized bowl, whisk together the flour, baking soda, baking powder, and salt until fully combined. Set aside.1 cup all purpose flour, 1/2 teaspoon baking soda, 1/2 teaspoon baking powder, 1/4 teaspoon salt
- In a large bowl with a hand mixer (or in a stand mixer fit with the paddle attachment) beat together the butter, brown sugar and granulated sugar, until light and fluffy. About three minutes. Then proceed to beat in the peanut butter until fully combined.1 cup unsalted butter, 1 cup brown sugar, 1/2 cup granulated sugar, 1 1/2 cups creamy peanut butter
- Beat the eggs into the butter/sugar/peanut butter mixture, one at a time. Finally, beat in the vanilla.2 large eggs, 2 teaspoons vanilla extract
- Add in the flour mixture all at once (see note 3) mixing it in on a very low speed until it just begins to combine and then up the speed just a little and mix in until the flour has just disappeared.
- Finally, stir in the chocolate chips, M&Ms, and oats.
- Dish the batter into the baking pan. It will be very sticky. Spray a spatula with cooking spray and use that to spread out the dough.
- Bake for 25 to 27 minutes or until the edges of the bars are golden brown. Allow to cool completely before cutting into 24 equal squares.
- Store in an airtight container for up to 1 week. See notes in the post about freezing.
Notes
- To measure the flour, spoon it into the measuring cup and level off the top, rather than scooping it right from the flour container.
- Both quick cooking and old fashioned oats (often sold as rolled oats) both work in this recipe. Just use what you have on hand. Keep in mind it will change the texture just a little bit because quick cooking oats are old fashioned oats broken down. It’s just a matter of personal preference.
- Most cookie recipes suggest that you mix in the flour a little at a time so that the flour does not fly everywhere and it suggest that you not over-mix. I recently read that you should add it all at once, mixing in slowly at first so it doesn’t go everywhere, and then just mixing until the flour disappears. This lowers the risk of over stimulating the gluten which can lead to a dense cookie.
Alissa K. says
Just the pictures of these look so delicious, cant wait to try! 👾🍪
I hope you love them, Alissa!
Brenda says
Way too much pb, will cut back on it next time.
Heather says
You’re missing the oats in the instructions and it didn’t seem like enough..1 cup?? Now i have to go find another recipe to fix this
The oats are added in step 6. I don’t know what to tell you about them not being enough – 1 cup was the perfect amount for this recipe.
Anne spencer says
Hiya what is quick cooking or old fashion mean in your recipe for monster cookies
That refers to the type of oats I use! They are sold both as old fashioned and quick cooking, and either will work in this recipe.
Amanda says
Made a double recipe, I reduced the peanut butter slightly and subbed half of the butter for coconut oil. They look fantastic
Also I mixed all my dry ingredients together and had no issue with folding in
Joan says
Sounds delicious, but my grandson is very allergic to peanut butter… do you have a similar recipe without the PB?
You might enjoy my M&M Cookie Bars. Otherwise you could replace it with sunflower butter and that would work just fine here.
Bobbi says
Love baking, but have one question on this recipe. If I use salted butter, can I just omit the salt or cut it back? Or does unsalted butter react different in baking?
It doesn’t react differently, its just a way to control the salt in the recipe. So if you use salted, I would omit the salt completely the first time you make it.
Trisha Monroe says
These look delicious. I love the thought of all the different ingredients added. Yes, definitely like several cookie flavors all rolled into one. I’m planning on making these in 3 days.
A side note, in step 8, you write “Allow to cut compltely….”, It should read “Allow to cool completely….”.
I apologize for sharing this, I tend notice things and this just stood out. (I get it from my mom.) I mean no disrespect.
Thank you!
Lisa says
I was excited to make these. However, I’m having trouble getting them done in the center. They are still soupy after about 40 minutes of baking. Probably won’t make them again.
Hey Lisa! I haven’t had that problem with these at all. Is it at all possible that your oven temperature is off? My other thought is the baking dish. A metal baking dish can really help with conduction. This is the one I love: https://amzn.to/3y4D47o