Mix first four ingredients and spread on an ungreased cookie sheet. Bake at 400° for 8-10 minutes or browned. Cool. Crumble in bowl and set 3/4 cup aside. Press reaining in 9 x 13" pan. Drizzle 1/2 jar of the caramel sauce over this and freeze 45 minutes. Softened the ice cream and spread over the frozen layer of crumb mixture. Sprinkle remaining 3/4 cup nut mixture over this and drizzle withremaining caramel sauce. Cover adn freeze 24 hours before serving.