Coffee with anything in it is naturally going to break a fast, since it is adding nutrition and calories into our body, even though it might only be a few calories. I myself often have coffee with a little cream because cream does not spike insulin, even though it does add a few calories. I have this in the mornings and then we go to the fitness center, where I swim for an hour and more than burn off those few cream calories, so I technically stay in fat-burning mode.
Coffee is one of the best anti-oxidants a person can use, and sometimes, I have a bit of coconut oil and butter in it, which is called bulletproof coffee, and this really gives me energy for the day until my meal, which is early afternoon after the fitness center and exercising.