In a resealable plastic bag, combine chicken taco seasoning, garlic powder, salt, and black pepper. Add chicken strips, several at a time, shaking to coat.
In 10-inch or 12-inch cast iron skillet, heat 1 tsp of oil over medium heat. Add chicken; cook 3 to 4 minutes or until there is no more pink, stirring frequently. Remove meat.
In the same skillet, heat remaining 1 tsp of the oil over medium heat. Add sweet peppers and onion; cook 8 minutes or until tender and golden, stirring frequently. Stir in mean and heat through.
Serve mixture in warm tortillas with remaining ingredients or additional toppings of choice.