1. Step
Heat oil in a large pot over medium-high heat. Add bell peppers, poblano and onion and cook, stirring often, until starting to soften, about 10 minutes. Push the vegetables to the edges. Add beef, garlic, cumin, coriander, ground pepper and salt to the middle and cook, crumbling the beef with a wooden spoon, until it's no longer pink, 3 to 5 minutes.