How to Make It
In a resealable plastic bag, combine the chile powder with the salt, cumin, onion powder, garlic powder, cornstarch, water and 2 tablespoons of the oil. Add the chicken, bell pepper and onion, seal and knead gently to coat. Refrigerate for 15 minutes.
Heat the remaining 1 tablespoon of oil in a large nonstick skillet until shimmering. Empty the contents of the bag into the skillet and cook over high heat, stirring occasionally, until the vegetables are crisp-tender and the chicken is cooked through, about 6 minutes. Remove from the heat and stir in the lime juice.
Transfer the chicken and vegetables to a large bowl and serve with the warmed tortillas, lettuce, cheese, salsa, sour cream and lime wedges.