Mix ingredients together. Chill 1 hour. Form into balls and bake at 350 degrees for 15 to 20 minutes.
You can skip the garlic and thyme if you use Italian bread crumbs.
Be sure to squeeze as much liquid out of the spinach as you can or they will fall apart. You can use a strainer and push it against the sides with you hands or a piece of cheesecloth and twist it tightly.
I usually use the Kraft parmesan in the green can, but it works great with the fresh grated as well.