Beat the eggs in a mixing bowl

Add the white cake mix and melted butter and beat to combine

Mix in 1 cup of the M&M'S and the white chocolate chips

Grease a 9 X 13 baking dish with cooking spray and use a rubber spatula to spread the cookie dough batter out evenly

Sprinkle the top of the batter with the remaining ½ cup of Christmas m&m's

Bake the cookie bars at 350 degrees for 20 - 30 minutes, until lightly golden brown and the middle is no longer wiggly

Allow to cool before cutting for best results

Store any leftover bars in an airtight container or ziploc bag and enjoy within 2-3 days