Rhubarb Cake
["2 c. flour", "1 c. (2 sticks) butter", "10 Tbsp. powdered sugar"]
["Mix; then press like a pie crust into a buttered 9 x 13-inch pan.", "Bake until light brown, about 15 minutes at 350\u00b0."]
["flour", "butter", "powdered sugar"]