Line an 8 by 8 square pan with aluminum foil.
Melt the chocolate chips over medium heat. While they are melting, stir in the sweetened condensed milk, stirring constantly.
When it is fully melted, add the vanilla and the amaretto and fully combine.
Pour the mixture into the pan and place in the refrigerator for at least four hours, though overnight is best.
Remove the foil lined fudge from the pan, remove the foil, and cut. Store in the refrigerator.