1/2 c. butter
1/2 c. packed brown sugar
1 c. flour
1/2 c. graham cracker crumbs
2 c. Kraft Mini Marshmallows
1 (16 oz.) pkg. semi sweet chocolate pieces
1/2 c. chopped walnuts

Beat butter and sugar until light and fluffy. Add combined flour and crumbs; mix well. Press onto bottom of greased 9-inch square pan. Sprinkle with remaining ingredients. Bake at 375 degrees 15 to 20 minutes or until golden brown. Cool; cut into bars.