Rhubarb Butter Crunch
["3 c. rhubarb, cut up", "1 c. sugar", "3 Tbsp. flour", "1 c. brown sugar", "1 c. oatmeal (rolled oats)", "1 1/2 c. flour", "3/4 c. margarine"]
["Mix rhubarb with sugar and 3 tablespoons flour.", "Stir and set aside.", "Combine brown sugar, oatmeal and 1 1/2 cups flour.", "Cut in the margarine until crumbly.", "Sprinkle half of the mixture into the bottom of a greased 9 x 13-inch pan.", "Pour the rhubarb over the crust and top with the rest of the crumbly mixture.", "Bake at 375\u00b0 for 40 minutes."]
["rhubarb", "sugar", "flour", "brown sugar", "flour", "margarine"]