add the butter, all chocolate chips, and the vanilla into a bowl and set aside
line and grease with cooking spray ~ a 9 x 13" pan with foil and set aside
in a saucepan combine the evaporated milk, sugar and marshmallows. Cook over medium heat, stir frequently until the mixture comes to a boil
continue to stir constantly at medium heat, scrape the bottom and sides of pan while stirring.
boil for 10 minutes ~ the fudge should be light golden brown.
pour the hot mixture into the bowl with the other ingredients, then use an electric mixer to gently combine all ingredients until smooth, then pour into 9 x 13" pan.
Chill in refrigerator. Once chilled, pull the tinfoil 'fudge slab' from the pan. Cut into small squares or bricks for gift giving.
fudge can be wrapped and stored in the refrigerator. Fudge can also be frozen for up to 3 months.
