Rhubarb topped with a crispy oatmeal topping.
Place rhubarb, sugar, corn starch and cinnamon in a bowl. Mix until rhubarb is coated with all ingredients.
Place rhubarb mixture in a greased 9 x 13 baking dish.
Place oatmeal, brown sugar, cinnamon and butter into a bowl and stir.
Spread oat mixture over rhubarb mixture.
Bake in a 350 degree oven for 45 minutes.
Serve warm with ice cream or whipped cream.
To reheat, warm in a 350 degree oven for 15 minutes.