After yet another failed attempt at making grilled cheese, I posted the following on facebook:
"It takes me five minutes to make a grilled cheese. I don't know if gramma Bobbie remembers, but she said mine were the best. I preheat the frying pan, put the cheese on the bread, butter both sides, then put it in the pan with a lid over it about 2min, flip, 2more min, then serve.You can't deprive the kids of grilled cheese,at least while we can still afford it. Praise the Lord!"
During the 2 minutes, I set the timer, and I waited patiently. The result: Perfect Grilled Cheese!
After 32 years, I finally know the secret.