Preheat the oven to 350℉ and grease a 9 inch pie pan with cooking spray.
In a medium sized mixing bowl, cream together the sugar cookie mix, egg, and cream cheese with a hand or stand mixer until well blended, about 2 minutes.
17.5 oz sugar cookie mix, 1 large egg, ½ cup whipped cream cheese spread
The mixture will seem dry at first but it will come together into a soft dough if you mix it for long enough.
Fold in the red and green M&Ms and then spread the dough into the prepared pie pan. Push it up the sides of the pan slightly to form a “crust” type shape.
¾ cup red and green M&Ms
Bake for 20-25 minutes or until it begins to turn golden brown all over and a knife or toothpick inserted in the center comes out clean.
Remove from the oven and let it cool completely.
Once the cookie pie has cooled, spread the cream cheese frosting over the top of the pie, leaving the edges unfrosted.
1 cup cream cheese frosting
Sprinkle the pie generously with Christmas sprinkles and slice like a pie to serve.