Prepare the fajita seasoning by combining chili powder, cumin, paprika, salt, onion powder, garlic powder, and cayenne pepper in a small bowl.
2
Trim any fat from the chicken breasts and then slice into ½-inch thick strips, lengthwise (long, thin strips). Sprinkle ½ the fajita seasoning mixture over the chicken and toss to coat evenly with the spice mixture.
3
Add the chicken stock to the inner pot, using ½ cup for a 3 or 6-quart Instant Pot or ¾ cup for an 8-quart model.
4
Add the seasoned chicken to the inner pot. Top with the sliced onion, sliced peppers, and minced garlic. Sprinkle the remaining fajita seasoning over the pepper and onions.
5
Seal the instant pot, being sure the vent knob is pointed to sealed or the lid is locked. Using the pressure cook or manual button, set the cooking time to 4 minutes on High Pressure. Once cooking time is finished let the pressure release naturally for 10 minutes.
6
Using a slotted spoon, transfer the chicken, onions, and peppers from the inner pot to a serving bowl. Add the zest and juice of the limes and toss to coat.
7
Serve the fajita mixture as desired on warmed tortillas or over rice with your favorite toppings.