Great, tasty, and oh so simple recipe! Excellent choice for a weeknight, as suggested! I followed the recipe, except doubled the fresh spinach and used fresh minced garlic.
Next time, I want to try Swiss or some other mild, soft cheese that has a bit more flavor than mozzarella (which didn't add much to the dish, in my opinion).
I'm thinking Swiss or Jarlsberg because they would add a buttery, nutty flavor that would likely pair well with the other ingredients. Will definitely make again!