Cream butter,shortening,brown sugar and egg. Stir in vanilla,salt and flour.Mixture will be very thick.Pat mixture into a greased 10x15 pan.
Bake at 325 degrees for 15-20 minutes. I bake mine for 15 minutes so they do not get hard. They should just be light brown. Sprinkle chocolate chips over hot bars.Return to oven just long enough to soften chips so you can spread over bars.Sprinkle with nuts if used. Cut into squares when cooled but not cold.
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