Season the chicken. In a bowl, toss chicken with olive oil, chili powder, cumin, smoked paprika, garlic powder, onion powder, chipotle powder (if using), salt, pepper, and lime juice.
Set aside while you prep the vegetables.
Cook the peppers and onions. Heat 1 tbsp olive oil in a large skillet over medium-high heat. Add the sliced peppers and onions, season with salt, oregano, and pepper, and cook 6–8 minutes, stirring occasionally, until softened with some char on the edges. Transfer to a plate.
Sear the chicken. In the same skillet, add the seasoned chicken in a single layer.
Cook 5–7 minutes, stirring once or twice, until browned and cooked through. If the pan looks dry, add a splash of water to lift the browned bits. Return the peppers and onions to the pan, toss, and keep warm over low heat.
Cook the cauliflower rice. In a separate large skillet, heat 1 tbsp oil over medium heat.
Add garlic and cook 30 seconds. Stir in riced cauliflower, cumin, and salt. Sauté 4–6 minutes until tender but not soggy.
Finish with lime juice and cilantro. Taste and adjust salt.
Assemble the bowls. Add a bed of cauliflower rice to each bowl. Top with chicken, peppers, and onions.
Add your favorite toppings: avocado, tomatoes, corn, beans, salsa, yogurt or sour cream, cheese, cilantro, and a squeeze of lime.
Serve. Finish with hot sauce if you like heat. Eat right away while everything is warm and fresh.