Combine the chocolate and butter in a small pan and set this over low heat to melt. Stir occasionally. Or use microwave to melt butter and chocolate.
Pour the sweetener and vanilla into the pan. Whisk until combined.
In a medium bowl containing the cream cheese, spread the melted chocolate mix all over it. Fold the ingredients together.
Slice macadamia nuts.
If preferred, gently drop sliced macadamia (or walnuts or almonds) into the mix. Stir for about 20 seconds.
Cover a pan with plastic wrap or parchment paper and spread the mixture into it. Take it to the freezer. Remove after 3-5 hours.
Slice with a sharp knife into bite-sized squares.
Video
Notes
You can cut this whole chocolate piece into 12 small pieces so you’ll get 12 servings. The fudge can be kept in the freezer and just take it out and leave at room temperature for a few minutes before you eat.