Flourless Monster Cookie Bars

Flourless Cookie Bars I’m Obsessed With

I have a slight obsession with monster cookies. The mini M&Ms, peanut butter, chocolate chips and oats. Okay, I’m obsessed with pretty much everything that is these Flourless Monster Cookie Bars! If you love monster cookies, you’ve gotta bake these ASAP. You’re going to love them!

Easier Than Making Cookies

These cookie bars are basically an easier version of monster cookies because they’re baked in bar form. No rolling, spacing or baking in batches until all the dough has been used. Just press and bake!

The dough comes together in no time. And unlike most cookie bar recipes, the oatmeal and peanut butter do most of the work. No flour or butter getting in their way! Just thick, flour-free chewy bars of peanut butter oatmeal chocolate candy loaded goodness. What’s not to love?!

Perfect for Parties

The oats come out toasty yet hold their chew and complement the flavor of the peanut butter, brown sugar and chocolates so well. These monster cookie bars make the perfect treat to bake for parties, after-school snack and of course, nightly dessert!

These bars bring all the kids to the kitchen (and adults too!). Every time I bake these (which has been quite often here lately!), we can hardly wait to slice into them.

What Do I Need to Make Flourless Monster Cookie Bars?

• Creamy or crunchy peanut butter (no-stir)
• Brown sugar
• Vanilla extract
• Large eggs
• Old-fashioned rolled oats
• Baking soda
• Kosher salt
• Mini chocolate chips
• Mini M&M candies
• 9×13 baking dish
• Parchment paper
• Nonstick cooking spray

How to Make Flourless Monster Cookie Bars

• Preheat oven to 350°F. Line a 9 x 13-inch baking dish with parchment paper and spray with non-stick cooking spray. Set aside.
• In the bowl of an electric mixer fitted with the paddle attachment, beat the peanut butter and brown sugar until smooth.
• Add the vanilla and then the eggs, one at a time, beating until well incorporated.
• Add the oats, baking soda and salt.

• Mix on low speed until just combined.
• Stir in the chocolate chips and M&Ms.
• Press mixture evenly into prepared baking dish. The dough will be crumbly at this point, but it should press perfectly into the pan.

• Bake for 30 minutes or until the top of the bars starts to turn golden brown.

• Remove from oven and lest rest for at least 15 minutes before slicing into.

How to Store Flourless Monster Cookie Bars

To store cookie bars, you can either leave them in the baking dish covered tightly with plastic wrap or place them in an airtight container on the counter for up to five days. 

To freeze cookie bars, place the bars in a freezer safe baggie or container with a sheet of parchment between each square. For extra freezer burn protection, wrap each bar with plastic wrap before freezing. When ready to enjoy, thaw loosely covered at room temp for several hours before serving.