Monster Cookie Bars

Directions

1. 1
   Pre-heat the oven to 350°F and line a 13x9-inch metal baking pan with greased parchment paper with a 2-inch overhang on each short side of the pan.In the bowl of a stand mixer fitted with the paddle attachment, cream together the sugar, brown sugar and butter until light and fluffy, about 2 minutes.
2. 2
   Add the eggs to the bowl, one at a time, beating between each addition then add the the peanut butter, vanilla extract, baking soda and salt and mix until well combined.
3. 3
   Add the oats and mix just until combined. Stir in the M&Ms and chocolate chips.
4. 4
   Transfer the cookie dough into the prepared pan, pressing it into an even layer.
5. 5
   Bake for about 30 minutes until a toothpick inserted comes out clean. (See Kelly's Notes.)
6. 6
   Remove the pan from the oven and allow the cookie to cool in the pan for 20 minutes. Using the parchment paper overhang, lift the cookie out of the pan and onto a cutting board. Slice the cookie into 24 bars and serve. Kelly's Note:For chewier, softer cookie bars, underbake the cookie and allow it to cool in the pan for 30 to 45 minutes before slicing and serving.