Rhubarb Pie

3/4 cup sugar
2 tbsp flour
2 cups rhubarb
1 egg
1 cup sour cream
1/2 tsp vanilla

Topping:
1/3 cup sugar
1 tsp cinnamon
1/3 cup flour
1/4 cup butter

Sift dry ingredients together. Add egg, sour cream, and vanilla - heat and add rhubarb. Mix, pour into unbaked pie shell. Bake at 400 for 15 minutes, then 350 for 30 minutes. Meanwhile, mix topping ingredients together. Sprinkle on pie and bake for 10 minutes more.