1 9-inch baked pie crust
1/3 cup all purpose flour
1/4 cup (packed) golden brown sugar
1 tablespoon minced crystallized ginger
1 teaspoon ground cinnamon
1/4 teaspoon ground nutmeg
2 tablespoons (1/4 stick) chilled unsalted butter, cut into cubes
1/3 cup walnuts, coarsely chopped
1 15-ounce can pure pumpkin
1 cup sugar
1/2 cup (packed) golden brown sugar
3 large eggs
1/2 cup (1 stick) unsalted butter, melted
1 teaspoon vanilla extract
Sweetened whipped cream
Preheat oven to 375 F.
Mix flour, sugar, ginger, cinnamon, and nutmeg in medium bowl. Add butter; rub in with fingertips until coarse meal forms. Stir in nuts.
For pumpkin filling:
Whisk pumpkin, 1 cup sugar, and 1/2 cup brown sugar in medium bowl. Whisk in eggs 1 at a time. Whisk in melted butter and vanilla. Pour into prepared crust.
Sprinkle streusel over filling. Bake pie until streusel is golden and filling is set, about 45 minutes. Cool on rack at least 2 hours. (Can be made 6 hours ahead. Let stand at room temperature.) Serve with sweetened whipped cream.