Gingerbread Jumble Bars are the best of both worlds, soft gingerbread bar cookies with white chocolate chips and M&M candies mixed in.
Preheat oven to 350°F.
Spray a 9 x 13" baking pan with non-stick spray. Set aside.
In a large bowl combine the cake mix, brown sugar, butter, eggs, and milk with a wooden spoon.
Fold in the chocolate chips and M&Ms.
Spread the batter into the prepared pan.
Bake at 350°F for 25-30 minutes-until just set.
Cool completely on a wire rack before cutting.