Streusel Topped Fruit Pie
["9-inch unbaked pie shell", "2 (21 oz.) cans pie filling (any flavor)", "1/2 c. all-purpose flour", "1/3 c. light brown sugar, packed", "1/4 c. margarine", "1/4 c. chopped nuts (optional)"]
["Preheat oven to 400\u00b0.", "Pour pie filling into pie shell.", "In bowl combine flour and brown sugar.", "Cut in butter until mixture is crumbly; stir in nuts.", "Crumble this mixture over pie filling. Bake 40 to 45 minutes or until top is golden brown and filling is bubbly.", "Remove from oven and let cool."]
["unbaked pie shell", "all-purpose", "light brown sugar", "margarine", "nuts"]