From one of my co-workers -- made them for a baby shower this weekend and they turned out great. One tip: Next time I'll make them smaller.
2 cups fresh bread crumbs (whole foods' is very good) (she was right about that)
1 lb frozen spinach, thawed
1 cup shredded Parmesan Reggiano (I used a blend of parmesan, fontina and something else)
3 garlic cloves minced
1 lg onion minced
1/2 tsp dried oregano
1/2 tsp dried thyme
1 tsp cayenne (I used a bit more of all the spices)
Form little ping-pong-size balls and lay on cookie sheet. Refrigerated covered 1 hour, then stick in preheated oven (350) for about a half hour. Keep an eye out -- shd be a light golden brown when done.