Prepare the fajita seasoning by combining chili powder, cumin, paprika, salt, onion powder, garlic powder, and cayenne pepper in a small bowl.
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.
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.
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.
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.
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.
Serve the fajita mixture as desired on warmed tortillas or over rice with your favorite toppings.
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Notes
Chicken Broth: For this recipe, you will only need to use ½ cup for a 3 or 6-quart instant pot or ¾ cup for an 8-quart model. Most of my recipes call for using at least 1 cup of liquid when pressure cooking, but for this recipe, the chicken, peppers, and onions will release enough liquid for pressure to be maintained. Fajita Seasoning: Use store-bought or homemade fajita seasoning, which is the blend of spices provided in the recipe card. Please note that if you opt to use table salt, rather than kosher salt, you may want to use only ¾ teaspoon.Chicken: I recommend using either boneless, skinless chicken breasts, cut into thin strips, or chicken tenders. That will ensure the cooking time is accurate.Peppers: Use any combination of bell peppers you like, such as red, yellow, and/or green.Storage: Store leftover cooled fajita mixture in an airtight container in the refrigerator for up to 3 days.