Bake a big batch in a flash.

Ever heard ofmonster cookies?

To know them is to love them.

Close up of an overhead view of Bar Cookies of the Gluten Free Monster Variety.

Kalisa Marie Martin

If you are familiar, you likely have connections to the Midwest, where theyre a favorite.

Imagine oatmeal peanut butter cookies studded with chocolate chips and M&Ms.

Once you try them, youll agree that they should be making them in all 50 states!

Gluten-Free Sheet Pan Monster Cookies stacked on a plate.

Kalisa Marie Martin.

Scooping, shaping, and baking cookies in batches takes time and effort.

Then, all you have to do is cut them into squares after theyve baked.

These cookies are soft, chocolatey, and nutty!

The BEST GF Monster Cookie Recipe sliced into squares and set on parchment paper.

Kalisa Marie Martin

Quick or Rolled Oats?

This recipe calls for quick oats, as the finer texture helps to bind the cookie dough together.

Your cookies will have a crumbly texture if you use old fashioned oats without pulsing them first.

Lining a pan with parchment to make Bar Cookies of the Gluten Free Monster Variety

Kalisa Marie Martin

This recipe calls for quick oats, as the finer texture helps to bind the cookie dough together.

Your cookies may have a crumbly texture if you use old fashioned oats without pulsing them first.

Line the jelly roll pan with parchment paper leaving a 1-inch overhang on the two long sides.

Adding flour to a bowl to make Bar Cookies of the Gluten Free Monster Variety.

Kalisa Marie Martin

You will use this later to lift the bars out of the pan.

In a medium bowl, whisk together gluten-free flour, gluten-free oats, salt, and baking soda.

Add the dry ingredients to the bowl of wet ingredients and stir to combine.

Whisking dry ingredients in a bowl to make Gluten-Free Sheet Pan Monster Cookies.

Kalisa Marie Martin

Reserve 2 tablespoons each of the M&Ms and chocolate chips.

Remove the top piece of parchment.

The middle may appear under done, but it will set as it cools.

Whisking sugars and egg in a bowl to make Gluten-Free Sheet Pan Monster Cookies.

Kalisa Marie Martin

Cool in the baking pan on a cooling rack for at least 1 hour.

Store in an airtight container at room temperature.

They will stay chewy for about 5 days.

Whisking sugars and egg in a bowl to make Gluten-Free Sheet Pan Monster Cookies.

Kalisa Marie Martin

Adding flour mixture to wet mixture to make Gluten-Free Sheet Pan Monster Cookies.

Kalisa Marie Martin

Adding flour mixture to wet mixture to make Gluten-Free Sheet Pan Monster Cookies.

Kalisa Marie Martin

Dough for The BEST GF Monster Cookie Recipe in a baking pan.

Kalisa Marie Martin

Pressing dough with parchment paper with hands to make Gluten-Free Sheet Pan Monster Cookies.

Kalisa Marie Martin

Gluten-Free Sheet Pan Monster Cookies ready to be baked.

Kalisa Marie Martin

Gluten-Free Sheet Pan Monster Cookies baked in pan.

Kalisa Marie Martin

Removing Gluten-Free Sheet Pan Monster Cookies from the pan by holding the parchment.

Kalisa Marie Martin

Sliced Gluten-Free Sheet Pan Monster Cookies.

Kalisa Marie Martin

Bowl of nutella puppy chow next to a smaller bowl with more on a counter with some pieces of puppy chow scattered around

Close-up: honey popcorn (filling up the entire photo)

Side view of a bowl of candied pecans.

Sweet and spicy chex mix in a bowl at a table setting with two glasses of beer and a yellow kitchen towel

overhead view of Classic Mixed Nuts on a sheet pan

Serving of spinach florentine breakfast casserole lifted from a casserole dish

Syrup drizzling onto a French Toast Casserole on white plate with fork

Everything bagel sandwich casserole in a casserole dish at a table setting with a serving on a plate, utensils, and cups of coffee

Monte Cristo croissant casserole in a casserole dish and in the surroundings, a serving on a small plate with a fork, a container of jelly, and cups of coffee

Plated serving of blueberry maple breakfast bake, drenched in maple syrup, alongside baking dish of the bake

Huevos rancheros casserole at a table setting with a stack of plates and utensils, a cup of coffee, a small bowl of herbs, and a spatula

Peanut butter blossoms in a wide ceramic bowl.

Chocolate crinkle cookies on a hot pink cooling rack

Smash sugar cookies on a plate

Platter of molasses spice cookies, one plated cookie, and a glass of milk

Platter of Mexican Wedding Cookies

Overhead shot of assorted sugar cookies on a white background

Gingerbread Bars frosted and decorated with festive sprinkles and set on a rack.

7 Layer Bars with Peanut Butter and Pretzels

Oh Henry bars on a crinkled parchment paper with a bowl of crushed peanuts

Close up of an overhead view of Bar Cookies of the Gluten Free Monster Variety.

Lemon Bars Recipe - lemon bars on blue plate

Stack of slices of marble brownies on a piece of parchment paper, and on the counter surrounding the stack, a carafe of milk and more slices of the brownies

stack of 3-ingredient brownie cookies

overhead view of Mint Brownies squares

Salted Caramel Brownies

Overhead view of chocolate truffles covered in cocoa and chopped nuts.

White chocolate and dark chocolate peppermint bark pieces

Overhead view of holiday chocolate and peppermint shortbread on a platter with crushed peppermint around it.

A square piece of the Easy Jam Cake on a pnik an white plate, with a piece of the corner cut off with a fork, also on the plate with some frosting still attached to the fork

Classic thumbprint cookies on a platter.

slice of cornflake tart on a plate and in the background, the rest of the tart on a plate

Cups of Dirt Cake with Gummy Worms

Overhead view of grasshopper pie cut into slices with one on a plate.