Grease baking pan with some butter or margarine (8 x 8 x 2 inch pan). Heat 1/4 cup milk and chocolate chips in saucepan over low heat until chips melt, stirring constantly. Remove from heat. Stir in 2 cups miniature marshmallows, 1/2 cup chopped nuts and a dash of salt. (The marshmallows will make little lumps in the candy). Spread the candy in the buttered pan with spatula. Refrigerate about 1 hour or until firm. Cut into 1 inch squares.