In a large skillet brown chicken pieces, onion, pepper, garlic, and olive oil over medium heat until chicken is cooked through.
Add tomato paste, chili powder, cumin, smoked paprika or chipotle, salt, pepper, cayenne, and lime juice. I sometimes will add 1/4 cup of water or chicken broth to make it a little saucy. Serve with desired toppings.
For mild chicken tacos:
For spicy chicken tacos:
What to serve with these tacos: