We recently visited My Fit Foods in Hermosa Beach, and we're pleasantly surprised. All of their meals come precooked, and are stored in a refrigerator.
They have a microwave at the store, or you can take the meals home and store them for a few days. From a choice of about 50 options (organized by breakfast, lunch, dinner and snacks) - only two choices were not gluten-free. We purchased the Korean BBQ and the tender loin - both were quite good. I hope we get another chance to go back.