I wish there was a simple recipe. But the principle is to have each focus on the other person's good qualities.
How do actually do it will vary widely from couple to couple. The book The 5 Love Languages may help. It was one of many that helped me.
Yeah, about that. I fell into the same trap. Now I have someone who thinks her relative superpower makes her more mature and me more infantile even though she grew up dyslexic and still cannot distinguish to/too/two (and even though my income, while more highly variable than hers, is also far, far greater). Apparently it's fairly common for this to very negatively affect relationships. How in the heck did you manage that?? (assuming you did)