1 c. flour
3/4 c. oatmeal
1 c. brown sugar
1 tsp. cinnamon
1/2 c. butter, melted
4 c. diced rhubarb

SAUCE:

1 c. white sugar
2 tbsp. cornstarch
1 c. water
1 tsp. vanilla

Preheat oven to 350 degrees. Mix flour, oatmeal, brown sugar, cinnamon and melted butter until crumbly. Divide in half. Press 1/2 of mixture into bottom of 9 x 9 inch pan. Cover bottom layer with 4 cups diced rhubarb.

In medium saucepan combine white sugar, cornstarch, water and vanilla. Cook until thickened and clear. Pour over rhubarb. Pat remaining crumb mixture on top. Bake at 350 degrees for 1 hour.