Preheat oven to 350 degrees. Spray two 9-inch cake pans with cooking spray and line bottom with parchment paper.
In a stand up mixer, cream the butter and sugars. Add in the eggs and vanilla and mix until combined scraping down the edges and bottoms of the bowl. Next, add in the flour, baking soda, and salt, and mix until combined. Fold in the chips, M&M's, and sprinkles.
Put the dough in the prepared pan. Use damp hands or a spatula to press down dough. Sprinkle on extra M&M's and sprinkles for decoration. Bake for 26-28 minutes or until the top is golden brown. Cool on wire rack for about 15 minutes before slicing and serving.
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Notes
You can buy a Giant Round Cookie Pan here. This cookie pie can also be formed and made on a pizza pan or baked in a 9 x 13 baking pan.