Pumpkin Apple Pie

1/3 cup
packed brown sugar
1 tablespoon cornstarch
½ teaspoon cinnamon
¼ teaspoon salt
1/3 cup water
2 tablespoons margarine
3 cups sliced peeled apples
Pastry for a 9-inch single crust
¾ cup canned pumpkin
¾ cup vanilla soy milk
1/3 cup sugar
1 egg
½ teaspoon cinnamon
¼ teaspoon salt
Whipped Cream 

Combine
brown sugar, cornstarch, cinnamon and salt in a medium saucepan.  Add water and
margarine; bring to a boil.  Add apples and simmer for 4 minutes.  Place apple
mixture in bottom of prepared pasty crust.   

Mix
pumpkin, soy milk, sugar, egg, cinnamon and salt in a medium bowl until
smooth.   

Pour
over apple layer.  Bake at 375^o for 50 to 60 minutes or until knife
inserted near the center comes out clean.  Cover with foil, if necessary to
prevent over browning the last 15 minutes of baking time.  Cool completely. 
Garnish with whipped cream.