All of these require some driving; they may or may not be worth it for you.
610-642-3050 • 47 E Lancaster Ave, Ardmore, PA 19003
This Chinese restaurant has offered cooking classes on and off throughout the years. They make my favorite hot/sour soup and lots of other good things.
Viva the Chef
1149 E Lancaster Ave # L1, Bryn Mawr, PA 19010
http://www.mainlineschoolnight.org/ <-- I highly recommend checking this out. I have taken many different MLNS classes over the years, though no cooking classes. They're affordable and low-commitment and sometimes excellent. The quality of instructors varies widely, but it's worth checking into to see if they offer anything you're interested in. I've seen various caterers and restauarnateurs offering classes, different kind of ethnic foods, or classes that focus on techniques or special nutrition. I've also seen classes on cheese and wine. Also, the classes meet in all different locations, so even though some places on the Main Line are doubtless a hike, maybe a class that you're interested in would meet nearer to your home or work or an accessible road. I seem to remember a wine class meeting at the William Penn restaurant on Route 202 closer to your way.