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Preheat oven to 300° F.
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Add a sheet of parchment paper to a 12 inch round pizza pan.
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Cream the butter, sugar, and brown sugar sugar together. I prefer doing this by hand but you could also use a mixer.
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Beat in the eggs and vanilla.
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Add flour, baking soda and salt into the batter and stir until well blended.
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Fold in chocolate chips and M&Ms.
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Place all of the batter onto the parchment paper and form it into a circle. Make sure to stop about 1.5 inches from the rim and to have the batter be as even in thickness as possible.
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If you are not adding a decorative design to the top, you might want to press some M&M’s lightly into the top for decorative reasons. Once baked, you will definitely have that pop of color on top.
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Bake on the center rack for 30 minutes and check. You want your cookie to be golden around edges and set in the middle.
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If decorating, let your cookie cool for at least 15 minutes before adding the top M&Ms. When you add the M&Ms and the cookie is still very hot, the candy coating will crack slightly.