Crumb-topped Loaf

This is sooooo tasty! I loved it and so did Allen!

Loaf:
1 1/2 cups flour
2 teaspoons baking powder
1 teaspoon pumpkin pie spice
1/2 teaspoon salt
1 egg
1/2 cup sugar
1 cup canned solid-pack pumpkin
1/4 cup vegetable oil
1 teaspoon vanilla

Topping:
1/2 cup butter, softened
2/3 cup packed dark-brown sugar
1 cup flour
2 teaspoons powdered sugar

1)LOAF: Heat oven to 350 degrees. Coat a loaf pan with nonstick cooking spray.
2) Mix flour, baking powder, pie spice, and salt in small bowl. Beat egg and sugar in large bowl. Beat in pumpkin, oil, and vanilla until smooth. Make a well in center of flour mixture. Add egg mixture. Stir just until moistened and batter comes together. Spoon batter into prepared pan.
3) TOPPING: Mix butter, brown sugar, and flour in small bowl until crumbly. Sprinkle over batter.
4) Bake loaf for 50-55 minutes, until wooden toothpick comes out clean. Cool in pan on rack 10 minutes. Turn out onto rack to cool completely. Dust with powdered sugar; slice.