Heat the olive oil in a skillet over medium-high heat. Season the beef with salt and pepper. Brown on all sides.
Place the beef stew meat in a 6-quart slow cooker.
Add the HATCH® Green Enchilada Sauce, fire-roasted diced tomatoes, chili beans with their sauce, diced onion, and cumin. Stir to combine. Season lightly with salt and pepper.
Cover and cook on Low for 8 hours or High for 4 hours, until the beef is fork-tender.
Stir the chili well and taste. Adjust the seasoning with additional salt and pepper if needed.
Ladle into bowls and garnish with avocado, cilantro, cotija cheese, lime wedges, or crushed gluten-free tortilla chips, if desired.