First Layer:
1 box yellow cake mix
1 egg
1/2 cup butter
Top Layer:
2/3 cup reserved milk
1 tsp. vanilla
1/4 cup packed light brown sugar
3 eggs beaten
1 1/2 cup dark brown sugar
1 cup chopped pecans
First Layer: Mix together and set aside 2/3 cup. Press remainder into a greased 9 x 13 pan, and bake at 350 degrees for 15-20 minutes or until a light brown.
Top Layer: Combine all ingredients except pecans in mixing bowl and mix well. Pour over first layer, top with pecans and return to 350 degree oven and bake 30 minutes more. Cool and cut into bars.