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Preheat the oven to 350°. Line a 9x13 pan with parchment paper and spray with cooking spray and set aside.
In a medium bowl sift together the flour, baking soda, and salt and set aside.
In the bowl of a mixer add the melted butter, brown sugar, and granulated sugar. Using the paddle attachment beat on medium-high until light and fluffy. Add in the eggs one at a time until fully combined. Add in the vanilla and mix until combined.
Add the dry ingredients to the sugar mixture and mix on medium-low until combined. Stir in the M&Ms and chocolate chips by hand.
Spread the dough into the prepared pan and bake for 30-35 minutes, or until golden brown and a toothpick comes out clean from the center. Allow cooling