1 (10 oz.) jar marshmallow creme
1 1/2 c. sugar
2/3 c. evaporated milk
1/4 c. butter
1/4 tsp. salt

Bring to a boil, stirring constantly over medium heat. Boil 5 minutes, stirring constantly. Remove from heat. Add:

Stir until melted and add: 1 tsp. vanilla

Pour into greased 8" square pan and chill until firm.