Stir milk and pumpkin in large bowl until smooth. Add pudding mixes and spice. Beat with wire whisk until well blended. Gently stir in 1/2 of the whipped topping. Spoon into crust.
Refrigerate 4 hours until set.
Sprinkle with streusel topping and add remaining whipped topping just before serving.
Streusel
Mix all ingredients in small microwavable bowl. Microwave on HIGH for 2 1/2 minutes or until bubbly, stirring once. Cool.