Make this recipe a recipe that people in that category can eat. categories: ['low_fat'], recipe: make topping: in large bowl, combine flour, oats, sugar. with fork mix in butter to make a crumbly mixture. in lightly greased 8x8x2 dish, combine all filling ingredients. add 1/4 cup water; stir to mix. sprinkle topping over mixture. bake at 350°f for 30 minutes.

Target recipe: preheat oven to 350, grease 9x13 baking dish. mix oats,brown sugar,flour and butter together, put 1/2 of mixture into the bottom of baking dish, place rhubarb over the mixture and sprinkle with cinnamon. in medium saucepan cook water,sugar,cornstarch and vanilla over medium heat until thick, let cool slightly,pour over rhubarb and sprinkle remaining oats+flour mixture on top bake for 30-35 minutes.