My Grandma use to ask me to make this for her all the time.
18 oz Chocolate chips
1 8oz sweetened condensed milk
1 1/2 tea vanilla
I use to add chopped almonds for my Grandma and sometimes chopped roasted pecans and mini marshmallows. I also have been known to add nuts with cranberries or any dried fruit you like.
In top of a double boiler melt chocolate stirring occasionally. Remove from heat stir in milk, vanilla and any nuts or dried fruit you like or no none at all. A swirl of peanut butter would be good. Pour into a waxed paper lined small baking pan. 8x8 cool and enjoy.
This is a east fudge to make for Christmas, you would add chopped candy cane to it, maybe instead of the vanilla you would add peppermint extract.