Prepare filling: In mixer bowl, combine egg substitute, milk and pumpkin, beating well. Add sugars, flour, spice and salt and mix well. Set aside.
Prepare crust: Melt margarine in 13 by 9 inch pan. In a bowl, mix remaining crust ingredients until well blended. Pour evenly over melted margarine in pan. Slowly pour pumpkin filling over crust mixture. Do Not Stir Filling Into Crust!