Turn your Instant Pot on and set it to the sauté mode.
Add oil and heat.
Add chicken and cook for 5 minutes until both sides are nice golden brown.
Once the chicken is browned, add in all remaining "chicken ingredients" and stir.
Secure the lid on and lock it, setting valve to the sealing position.
Cook on high pressure for 10 minutes.
Once pot beeps, set the valve to the venting position for a quick pressure release.
Unlock the lid and allow the chicken to cool for a bit.
Shred your chicken using two forks, or pulse lightly with a food processor, or mixer with paddle attachment.
Place the shredded meat back into the pot and stir it into the sauce.
To assemble your tacos:
"Toast" tortillas in a large skillet for a minute on each side, over medium-high heat.
Load up your tortillas with shredded chicken and sauce.
Top with chopped avocado, cherry tomatoes and green onions.
Sprinkle with cheese and garnish with cilantro leaves if you like.
Serve immediately and enjoy!