For a richer flavor, consider browning the round steak in a separate pan before adding it to the chili. Adjust the amount of Hatch chiles to your desired level of heat. If you prefer a milder chili, use less chiles or substitute with a milder variety of green chile. The chili can be made a day ahead of time and refrigerated. The flavors will continue to develop overnight, making it even more delicious the next day. Serve with your favorite toppings, such as shredded cheese, sour cream, chopped onions, or a dollop of plain Greek yogurt.