Heat oven to 350° F. Melt butter with chocolate chips in saucepan over low heat, stirring occasionally. When chocolate chips are melted, blend in sugar, salt, and vanilla. Add eggs one at a time, beating well after each addition. Stir in flour and nuts. Spread in buttered 9″x13″ baking dish. Bake for 20-25 minutes. Sprinkle immediately with marshmallows then drizzle with glaze. Allow to cool completely and cut into squares.