Irish Cream Fudge - cooking recipe

Ingredients

2 (12 ounce) packages milk chocolate chips
1 (12 ounce) package semi-sweet chocolate chips
2 (7 ounce) jars marshmallow cream
2 teaspoons vanilla extract
2/3 cup irish cream (alcoholic beverage such as Baily's Irish Cream)
2 cups of chopped nuts (optional)
4 1/2 cups granulated sugar
1 (12 ounce) can evaporated milk
1/2 lb butter (1 cup)

Preparation

In a very large bowl, combine the 2 packages of milk chocolate chips, the one package of semisweet chocolate chips, both jars of marshmallow cream, 2 teaspoons of vanilla extract, the Irish Cream, and nuts if you are adding them.
Set this mixture aside.
Line a 10-x-15-inch pan with foil and spread lightly with butter or margarine.
In a medium sized saucepan, combine 4 1/2 cups of granulated sugar, 1 can of evaporated milk, and 1/2 pound of butter.
Bring to a gentle boil over medium heat first and then cook slowly, stirring constantly for about 10 minutes.
Pour the milk mixture into the very large bowl holding the chocolate chip mixture.
Stir slowly by hand to combine.
It is very important to do this by hand and NOT use any kind of mixer.
Pour the fudge into the prepared pan and chill until set.