Prep the veggies: Slice the peppers and onion into thin strips.
Add them to the bottom of the slow cooker.
Mix the seasoning: In a small bowl, combine chili powder, cumin, smoked paprika, garlic powder, onion powder, oregano, salt, and pepper.
Season the chicken: Place the chicken on top of the veggies. Drizzle with olive oil, sprinkle the spice mix evenly over the chicken, and pour the diced tomatoes with green chiles around the sides.
Slow cook: Cover and cook on Low for 4–5 hours or High for 2–3 hours, until the chicken is tender and easily shreds.
Shred and finish: Remove the chicken, shred with two forks, and return it to the slow cooker. Stir in the lime juice and cilantro.
Taste and adjust salt if needed.
Build your bowls: Spoon the chicken and veggies over cauliflower rice or greens. Top with avocado, sour cream, cheese, salsa, and jalapeños as desired.