Combine the first four ingredients in a large bowl.Combine flour and the next three ingredients;stir into sugar mixture .Fold in chopped Snickers bars. Spoon batter into a greased and flour 13-x 9-x 2 inch pan; sprinkle with chopped Hershey's bars.Bake at 350 deegrees for 30 to 35 minuets.Cool on a wire rack, then cut into squares.