Marinate the Steak: In a small bowl, whisk together the chipotle peppers, oil, lime juice, cumin, salt, and pepper. Coat the steak evenly and let it marinate for at least 30 minutes (or up to 2 hours for deeper flavor).
Prepare the Cauliflower Rice: Heat ½ tablespoon avocado or olive oil in a skillet over medium heat. Add riced cauliflower, season with salt and pepper, and sauté for 4-5 minutes until tender. Set aside.
Roast the Veggies: Preheat the oven to 400°F (200°C). Toss the sliced red bell pepper and onion with avocado oil, cumin, salt, and pepper. Spread evenly on a baking sheet and roast for 15-20 minutes, stirring halfway through, until slightly caramelized.
Cook the Steak: Heat a grill or skillet over medium-high heat. Sear the steak for about 3-4 minutes per side, or until it reaches your desired doneness. Let it rest for 5 minutes before slicing against the grain.
Assemble & Serve: Plate the cauliflower rice, top with roasted veggies, and add the sliced steak. Serve with a squeeze of lime for extra freshness.