In a small bowl, cut butter into flour and sugar until crumbly. Mix in nuts. Press dough into a lightly greased, 8-inch square baking pan. Bake at 350°F, 12-15 minutes or until lightly browned. Meanwhile, in a medium bowl, beat together remaining ingredients, except pie filling, until smooth. Remove crust from oven, spoon filling over crust; top with pie filling or jelly. Stir slightly to create swirl pattern. Bake at 350°F, 25 minutes or until set. Cool and cut into 2-inch squares.