Preheat the oven to 350 degrees. Mix the cake mix, oats, butter and 1 egg. Reserve 2 cups of the mixture
Press the remaining mixture into the bottom of a 9x13-inch cake pan. Blend the icing, cream cheese, sour cream, and remaining 2 eggs and pour over the top.
prinkle the remaining 2 cups of crumb mix over the top and bake for 45-55 minutes. Cool bars to room temperature and then store in the refrigerator.
*Optional: Sprinkle with powdered sugar before serving.