For adding fat, I would just put butter and oil (I use mct) in a cup of coffee or tea. What about avocado with mayo and salt. Butter in a cup of broth. You could mix cream cheese mixed equal parts with almond butter (or any nut butter) it makes a pretty good pudding like consistency and doesn't need sweetener. I don't care for cocoa powder left unsweetened, but carob powder is a bit easier for me to do for some reason, you could add a hint of that for depth of flavor.