1/2 c. butter
1/2 c. packed brown sugar
1 c. flour
1/2 c. graham cracker crumbs
2 c. miniature marshmallows
1 (6 oz.) pkg. semi-sweet chocolate chips
1/2 c. chopped walnuts

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