Mix together brown sugar, flour, butter, oatmeal, and cinnamon.
Press half of the crumb mixture into the bottom of a 9X9 pan.
Sprinkle rhubarb on top of the pressed crumb mixture.
Boil the sugar, water, corn starch, and vanilla until thick. Pour over rhubarb.
Sprinkle with the remaining crumb mixture.
Bake at 350F for 10 to 15 minutes. Enjoy!
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1404 33rd St S, Suite H • Fargo, ND 58103 | (701) 205-4174