Cut the chicken breasts into bite-sized pieces.
Set the Instant Pot to the 'Sauté' function. Add the olive oil and let it heat for a minute. Add the chopped onion and minced garlic, cooking until the onion becomes translucent.
Stir in the chicken pieces, cooking for about 2-3 minutes until lightly browned.
Sprinkle chili powder, cumin, smoked paprika, salt, and black pepper over the chicken. Mix well to coat.
Pour in the chicken broth, scraping the bottom of the pot to release any browned bits.
Close the Instant Pot lid, ensure the vent is sealed, and select the 'Manual' or 'Pressure Cook' setting for 10 minutes.
Once cooking is complete, allow for a natural pressure release for about 5 minutes, then carefully switch to a quick release for any remaining pressure.
Open the lid and use a fork or slotted spoon to shred the chicken directly in the pot, mixing it into the sauce.
Warm tortillas in a skillet or microwave. Spoon the chicken mixture onto each tortilla and top with cilantro and any additional toppings of choice.