1 c. sifted flour
3/4 c. oatmeal
1 c. brown sugar, firmly packed
1 tsp. cinnamon
1/2 c. melted butter
4 c. diced rhubarb
1 c. sugar
2 tbsp. cornstarch
1 tsp. vanilla
1 c. water

Mix the first 5 ingredients until crumbly. Press 1/2 of mixture into a greased 9-inch pan. Pour rhubarb over crumbly mixture in pan. Combine and cook the remaining 4 ingredients until thick and clear. Pour over rhubarb and top with remaining crumbly mixture.

Bake at 350°F for 1 hour.

Yields 1 (9-inch) pan.