Sour Cream-Rhubarb Squares

Description Excellent with ice cream or whipped topping. Ingredients ½ cup white sugar 1 tablespoon butter 1 ½ cups packed brown sugar 1 egg 1 teaspoon baking soda 1 cup sour cream ½ cup chopped walnuts 1 teaspoon ground cinnamon ½ cup shortening 2 cups all-purpose flour ½ teaspoon salt 1 ½ cups chopped rhubarb Servings: 20