Prep the veggies: Slice the peppers and onion into thin strips. Mince the garlic.
Lightly oil the slow cooker insert to prevent sticking.
Mix the seasoning: In a small bowl, combine chili powder, cumin, smoked paprika, oregano, salt, pepper, and cayenne if using.
Layer in the slow cooker: Add half the peppers and onions to the bottom. Place the chicken on top. Sprinkle the seasoning mix evenly over the chicken.
Add the minced garlic, drained tomatoes or salsa, and chicken broth. Top with the remaining peppers and onions. Drizzle with olive oil.
Cook low and slow: Cover and cook on Low for 4–5 hours or on High for 2–3 hours, until the chicken is tender and reaches 165°F internally.
Low produces juicier results.
Shred the chicken: Transfer the chicken to a cutting board and shred with two forks, or slice if you prefer chunks. Return it to the slow cooker and toss with the peppers, onions, and juices.
Brighten it up: Stir in the lime juice. Taste and adjust seasoning with extra salt, pepper, or a pinch more chili powder.
Build your bowls: Spoon rice or your chosen base into bowls.
Top with the chicken and fajita veggies. Add your favorite toppings—think avocado, cheese, cilantro, and a dollop of Greek yogurt.
Serve: Finish with lime wedges for squeezing and extra jalapeños if you like heat.