Step #2 In a large bowl, mix the pumpkin, sweetened condensed milk, 3/4 tsp cinnamon, egg, the ginger, nutmeg, & salt; mix well.
Step #3 pour this into the crust & bake for 15 mins; remove the pie from the oven.
Step #4 Reduce the heat to 350 degrees F.
Step #5 In a small bowl, & the remaining 1/2 tsp cinnamon; using a pastry cutter or 2 knives, mix the brown sugar, flour, cut in the margarine until crumbly.
Step #6 stir in the the walnuts & Sprinkle top over the pie.
Step #7 Bake for 35 to 40 mins, or until a knife inserted in the center comes out clean.
Step #8 allow this to cool completely, then cover and chill until ready to serve.
Step #9 NOTE: Top each slice with a dollop of whipped topping & some candy corn or a walnut half.