Coffee is inherently full of antioxidants. For example, see
http://www.ncbi.nlm.nih.gov/pubmed/21462335
Then, if you choose butter form grass-fed cows, you get a healthy dose of Vitamins A, E and conjugated linoleic acids which are found at much lower levels in butter made from cream derived from grain-fed cows. Butter can be a much healthier fat source than the likes of margarine.