I coated my 14" skillet with Safflower oil, and did not add chilies. I used 16 ounces of pre-cooked black beans (not from can). As the last step, I could only fit half of the rice into the skillet so perhaps the author used a 16" pan. It was ok as it was, but I would double the tomato if I make it again. To my surprise, I added hot sauce to my served portion and that really enhanced the flavor and somehow was not too spicy. It had a bit of a greasy after-taste, but that may have been the Safflower oil. I took photos and have uploaded them.
Wonderful stuff, easy to put together. As you said, this meal contains stuff that I nearly always have on hand. I made it with a bit more meat and added some corn and black olives, so I needed an extra can of tomatoes (with chiles added in). Served with cheddar cheese and sour cream for toppings. Thanks for sharing!