1 1/2 C. Sugar 2/3 C. Evaporated Milk 1/2 C. Butter 2 C. Marshmallows 1 C. Chocolate Chips 1/2 tsp. Vanilla Cover 8x8 pan with foil, and spray. Spray sauce pan. In pan, combine sugar, evaporated milk, and butter. Cook over medium-high heat until it boils. Reduce heat to medium and continue cooking, stirring constantly, for 6 minutes. Remove pan from heat, and add the chocolate, marshmallows, and vanilla. Beat by hand for 1 minute. Spread fudge into prepared pan. Score while still warm. Cover and chill for 2-3 hours, or until firm.