Line an 8x8 square pan with aluminium foil. Set aside.
In a large saucepan over medium heat, combine marshmallow creme, sugar, evaporated milk, butter and salt. Bring to a full boil, and cook for 5 minutes, stirring constantly.
Remove from heat and pour in semisweet chocolate chips and milk chocolate chips. Stir until chocolate is melted and mixture is smooth. Add vanilla and peppermint extract and stir. Pour into prepared pan. Sprinkle crushed peppermint over fudge and gently press down to set. Chill in refrigerator for 2 hours, or until firm.
Package the fudge in small boxes to give as edible holiday gifts.
The fudge will keep in the refrigerator for up to 2 weeks.