How to get rid of “Man Boobs”?

I have been letting myself go way too much in the past few years. I lost all the hard work I had built up due to the “Happy relationship weight”. However now I’m hella self conscious about my body. I’ve been easing myself back into getting fit for the past 3 months. My biggest thing is i absolutely HATE the man boobs I’ve developed. I feel they are abnormally big. Is there any specific workouts I can do to reduce them while I build up my chest?