Make coffee: Brew coffee as you normally would. Make sure it’s the right kind of coffee. If you haven’t purchased Bulletproof Upgraded Coffee beans, read this post to find the best coffee in your area. Use a brown paper filter.
Pre-heat blender: Boil extra water and pour it into a blender while your coffee brews to pre-heat the blender.
Froth: Empty hot water from the now pre-heated blender and add the brewed coffee, butter, and MCT oil. Blend until there is a thick layer of foam on top like a latte. A Blend-tec or Vitamix blender will do it quickly, a normal countertop blender takes longer, and a handblender works ok if you don’t have a real blender.
Optional: Add cinnamon, vanilla, dark chocolate, or a sweetener like Stevia, erythritol, or xylitol (this is technically a sacrilege if you use awesome beans, but some people love their mocha…)