In a small bowl, combine the lemon juice, lime juice, and spices and whisk together.
Cut the peppers and onion into strips.
Add the chicken, olive oil, peppers and onions to the pot along with 1 cup of water. Stir in the seasoning mix, making sure everything is well mixed. Place the lid on the Instant Pot and turn the steamer valve to “seal”.
Press the “manual” button and set the timer for 10 minutes. Once the timer beeps to indicate it is done, carefully open the steam valve by turning it to “vent”- be careful as hot steam will quickly escape!
Mix the cornstarch in a small bowl with about 3 Tbsp of water.
Open the lid and add the cornstarch mix. Press the saute button and bring the mixture to a boil, stirring occasionally. Let boil for about 2 minutes.
Serve the fajitas while hot in flour tortillas! Enjoy!