Preheat oven to 350°. Place rhubarb, strawberries, Rhubarb Strawberry Fruit Spread and brown sugar in a greased 9 x 13 pan; stir until coated. In a medium bowl, combine butter, Nana’s Apple Cake Mix and oatmeal; stir until crumbly. Sprinkle over fruit mixture. Bake about 45 minutes. Serve warm with ice cream. Makes 12-15 servings.