I don't do the bulletproof coffee thing with butter, although I do have my own upgraded coffee recipe :

Take about 2.5 L of good water and mix in
1.5 teaspoons of ground, dried chaga mushroom
1.5 teaspoons of ground, dried lion's mane mushroom
Bring to a boil and then reduce and simmer for two or three hours and then filter off the liquid. Sometimes you can add new water to the solid mater and boil again to get more of this tea. You will know you've used up the mushrooms when the water doesn't get dark brown anymore. Technically this liquid is a mushroom decoction.

Then I grind some coffee beans (about 1.5 teaspoons) and put it into a french press. Then I pour hot mushroom decoction (roughly 1.25 L) over the ground coffee beans and let steep about six or seven minutes before decanting into a tea pot.

Then I mix in a small pinch (about 1/8th teaspoon) of pure borax crystals, 1 teaspoon of creatine monohydrate, a half teaspoon of ginseng infused honey and a splash of organic grass fed cream (10% milk fat.)

Sometimes I'll take a gelcap of Ubiquinol (an active form of Co-Q 10) with this.

I enjoyed hearing about your upgraded coffee! I've upvoted this post and followed you.