Mix all of the above well in a bowl. Spread half of the mixture onto the bottom of a 9-by-9 baking dish. Reserve the rest.
Filling: Cook 4 cups cut rhubarb, 2 cups water and 1 cup sugar. Thicken with 3 tablespoons cornstarch. Add 1⁄2; teaspoon almond flavoring (optional). Spread filling over crust mixture, and then top filling with the reserved crust. Bake at 350 or until golden.
Recipe by Amish 365 at https://www.amish365.com/32490-2/