
Prepare the marinade: Combine steak, olive oil, lime juice, chipotle peppers, garlic, cumin, oregano, and black pepper in a bowl. Rub the steak well with the marinade and refrigerate for at least 30 minutes.
Slice the bell peppers, onions, and tomatoes while the steak is marinating, and prepare the rice.
Heat a cast iron skillet. Once hot, add the steak and cook for 4-5 minutes, then flip and cook for another 4-5 minutes. Adjust time for preferred doneness.
Remove steak from the pan and let it rest for 10 minutes before slicing.
Sauté the vegetables in the pan with leftover marinade until softened, about 3-5 minutes.
Assemble bowls with rice, romaine lettuce, corn, black beans, baby tomatoes, fajita vegetables, sliced steak, and a scoop of guacamole. Serve immediately.