Mix all seasoning ingredients in small bowl.
Slice chicken into thin ½ inch strips.
Toss chicken with 1 tablespoon oil, lime juice, garlic, and half the seasoning. Let sit.
Slice peppers and onion into strips.
Heat 1 tablespoon oil in large skillet over high heat.
Add chicken in single layer. Do not overcrowd.
Cook 3 to 4 minutes without moving.
Flip. Cook 3 to 4 more minutes until done and charred.
Transfer to plate. Cover to keep warm.
Add remaining oil to pan.
Add peppers and onions. Sprinkle with remaining seasoning.
Cook 5 to 7 minutes until tender and charred.
Return chicken to pan. Toss together. Cook 1 minute.
Warm tortillas.
Serve with toppings.