Creamy Pumpkin Pie

1 1/4 cups cold milk
1 cup canned pumpkin
2 pkg. (4 serving size) Jell-O Cheesecake Flavored Instant Pudding
1 tsp. pumpkin pie spice
1 tub (8 oz) Cool Whip
1 graham cracker crust
Streusel topping (recipe follows)

Stir milk and pumpkin in a large bowl until smooth. Add pudding mixes and spice. Beat with a wire whisk until well blended. Gently stir in 1/2 of the whipped topping. Spoon into crust. Place in fridge. Add Streusel Topping just before serving. Add remaining Cool Whip if desired.

Streusel Topping:
Mix 1/2 cup chopped walnuts, 2 Tb. brown sugar and 1 Tb. butter in a small microwavable bowl. Microwave on high for 2 1/2 minutes or until bubbly, stirring once. Cool.