This is recipe from my mom with my variations of added unsweetened chocolate and the vanilla. It makes the fudge a little less sweet, and I like the addition of the vanilla flavoring. You could probably try with other different flavorings also.
4 cups sugar
1 large can Carnation
1/3 stick butter
Bring to a full boil and cook 5 minutes. Remove from heat.
1 teaspoon vanilla
9 oz Hershey’s milk chocolate
12 oz package semi-sweet chocolate chips
3 oz. unsweetened chocolate
Small jar marshmallow fluff
Mix all together until well mixed and chocolate and marshmallow are melted completely.
Add 2 cups chopped walnuts.
Pour onto lightly buttered cookie sheet.
Makes 5 pounds
My mom would make it with black walnuts...but they are hard to find, and expensive when you can find them.