In a small bowl, mix Chili Powder, Cumin, Oregano, Fresh Lime Juice, Olive Oil Cayenne and Pepper. Toss chicken in marinade until coated, refrigerate for 30 minutes.
Heat oil over medium high heat in large cast iron or non-stick skillet. Heat for several minutes before adding chicken.
Add chicken to pan and cook for 5 - 7 minutes. Do not disturb the chicken once it is in skillet for 5 full minutes. If the chicken releases easily it is ready to turn.
Flip chicken and cook another 5 - 7 minutes. Remove from pan and let rest for 5 minutes.
Add 2 tsp olive oil, peppers and onions to skillet. Season with salt and pepper to taste. Cook for approximately 5 minutes, until they are slightly tender.
Cut chicken in thin slices and return to pan with juice from half a line.
Cover and cook for 2 - 3 minutes.
Serve in tortillas and with your favorite toppings.