Yes, you can, but it is still an OFAC violation. Whilst not much enforced, it is always possible a US citizen or resident travelling to Cuba can be held accountable to OFAC - at worst, a significant fine and at least, I'd not count on Global Entry, etc.

I don't have any problem with those US people who travel through the "back door", but one should do so aware of possible adverse consequences and make an informed risk management decision as to if this is what one wants to do. (For me, I have worked a lot with US Government and law enforcement organisations over the years, so I chose to travel legally to Cuba with a licensed company, like Grand Circle Foundation.)