Ingredients Original recipe yields 9 servings Crust: 1 cup all-purpose flour 1 cup brown sugar ¾ cup old-fashioned oats ½ cup butter, melted 1 teaspoon ground cinnamon 4 cups chopped rhubarb Sauce: 1 cup water 1 cup white sugar 2 tablespoons cornstarch 1 teaspoon vanilla extract Directions Instructions Checklist Step 1 Preheat oven to 350 degrees F (175 degrees C). Step 2 Mix flour, brown sugar, oats, butter, and cinnamon together in a bowl until crumbly; press into the bottom of a 9-inch square baking dish. Spread rhubarb in an even layer over the crust. Step 3 Stir water, sugar, cornstarch, and vanilla extract together in a saucepan over medium low heat; cook, stirring occasionally, until thick and clear, 5 to 10 minutes. Drizzle sauce over rhubarb. Step 4 Bake in preheated oven until topping is set, about 1 hour.
