This isn’t as much about a specific coffee as it is about a coffee technique.
You may have heard of this, as it has recently become more mainstream.
Basically, you get coffee.
Then, you grind it, and, if you make coffee like I do, put it in your french press, with a small pat of butter (salted or unsalted). If you make it in a drip coffee maker or something else, it would probably work best to just put the butter in your cup.
(A dash of milk and a pinch of sugar makes it perfect.)
And there it is. Butter coffee. It’s very filling, even though there isn’t that much more fat in it, the bitterness is reduced, and the flavour is enhanced; almost tasting a little caramel-y.