To prepare filling: Combine 1st 8 ingreds in large bowl; stir with a whisk.
Crust: Roll dough to an 11 inch circle. Fit into a 9" pie plate coated with spray. Fold edges under and flute.
Streusal: Lightly spoon flour into a dry measure;level with knife. Combine flour and next 5 ingreds in a bowl. Cut in butter with a fork or fingertips til crumbly. Sprinkle with water, tossing with a fork just til lightly moistened.
Pour pumpkin mixture into crust; sprinkle with steusal. Place pie on baking sheet. Bake at 375 for 50 min or tl knife inserted in center comes out clean. Cool on wire rack.