Bailey's Irish Cream Fudge

4-1/2 cups sugar
1 can (12 ounce) evaporated milk
1 cup butter
2 packages (12 ounces each) milk chocolate chips
1 package (12 ounces) semi-sweet chocolate chips
2 jars (7 ounces each) marshmallow cream
2 teaspoons vanilla extract
2/3 cup Bailey’s Irish Cream
2 cups chopped nuts (optional)

Butter a 9 x 13 x 2-inch baking pan. In a large bowl, add chocolate chips, marshmallow cream, vanilla, Bailey's Irish Cream and nuts. Set aside. Heat butter, sugar and milk to a boil, reduce heat and cook slowly for 11 minutes, stirring constantly. Pour milk mixture over the ingredients in bowl and stir slowly, by hand, to blend. Pour fudge into prepared pan and chill. When fudge is set, cut into 1-inch pieces.