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

Preheat oven to 350 degrees.

Cook sugar, cornstarch and water together in a small saucepan over low to medium heat. Stir until sugar is dissolved and cornstarch is well mixed. Add vanilla, stir, and remove from heat.

In a separate bowl, mix together brown sugar, oatmeal, cinnamon, flour and butter.

Grease a 9 inch square cake pan. Press half of the sugar-oatmeal- flour mixture in cake pan. Cover with rhubarb. Pour on the cooked sauce. Sprinkle on the balance of the sugar-oatmeal-flour mixture.