Monster Cookie Bars

Step 1 -Preheat the oven to 350 degrees F.

Step 2 -Line a jelly roll pan with parchment paper, leaving an 1-inch-long overhang on the two long sides of the pan.

Step 3 -In a medium bowl, add the flour, the quick oats, the salt, and the baking soda and whisk to combine.

Step 4 -In a large bowl, add the butter, the brown sugar, the peanut butter, the egg, and the vanilla extract and whisk until it is completely smooth.

Step 5 -Add the flour mixture to the peanut butter mixture and stir to combine.

Step 6 -Reserve 2 tablespoons of the M&Ms and 2 tablespoons of the chocolate chips.

Step 7 -Add the remaining M&Ms and the remaining chocolate chips to the cookie dough and stir to combine.

Step 8 -Turn the cookie dough onto the prepared jelly roll pan.

Step 9 -Place a sheet of parchment paper on top of the cookie dough and use your hands to gently and evenly press it into the jelly roll pan.

Step 10 -Discard the top sheet of parchment paper, then evenly sprinkle the reserved M&Ms and the reserved chocolate chips over the cookie dough. Slightly press them into the dough.

Step 11 -Bake the cookie bars until the dough has risen and the edges just begin to turn slightly golden, about 15-17 minutes. Note: The center of the cookie bars may seem underdone but it will set as it cools.

Step 12 -Transfer the jelly roll pan to a wire rack and let the cookie bars cool, about 1 hour.

Step 13 -Use the overhanging parchment paper to transfer the cooking bars to a cutting board, then use a sharp knife to cut them into 24 even squares.

Step 14 -Serve.