Raspberry Crumb Bars
["1 c. butter at room temp.", "1/2 c. sifted powdered sugar", "2 c. all purpose flour", "1/2 tsp. salt", "1/2 c. rolled or quick oats", "1/4 c. chopped walnuts", "3/4 c. seedless raspberry preserves"]
["Position rack in the center of the oven and preheat to 375 degrees. Butter a 9 x 9 pan."]
["butter", "powdered sugar", "flour", "salt", "rolled", "walnuts", "seedless raspberry preserves"]