Preheat the oven to 350 degrees.
In a large bowl combine the cake mix, oil, and eggs. Mix well until combined.
Fold in the M&M's and white chocolate chips.
Scoop out the batter with a 1 1/2 inch cookie scoop and drop on a cookie sheet 2 inches apart.
Bake for 8-10 minutes or until the cookies just look set. Allow to cool for 1 minute on the cookie sheet then remove to a wire rack to cool completely.