Peanut Butter Melt Away Fudge

3 1/2 cups sugar
1 1/2 cups (12-oz. can) evaporated milk
1/2 cup (1 stick) butter or margarine
2 tablespoons light corn syrup
1 tablespoon white vinegar
2 1/2 cups runchy peanut butter
1 jar (7 oz.) marshmallow creme

In a 4-quart saucepan, combine sugar, evaporated milk, butter, corn syrup, and vinegar. Cook over medium heat, stirring constantly, until mixture comes to full rolling boil; boil and stir 5 minutes. Remove from heat. Add peanut butter and marshmallow creme; stir until smooth. Spread into ungreased 13x9x2-inch pan; cool completely. Cut into squares. Store in tightly covered container at room temperature.