Add the liner to your Instant Pot and press the saute button. Add the oil and butter to the pot and melt. Add the garlic and sauté for 60 seconds.
2 tbsp extra virgin olive oil, 2 tbsp butter, 3 tbsp minced garlic
Add the chicken to the pot, sprinkle the garlic powder out over top, and cook for 3 minutes- stirring often. Pour the broth into the pot and press the chicken down into the liquid as much as possible.
2 1/2 - 3 lbs boneless, skinless chicken breasts, 2 tsp onion powder, 1 cup chicken broth
Add the lid, turning to close, and set the vent valve to the 'sealed' position. Press the 'cancel' button and then pressure cook on HIGH pressure for 4 minutes.
While the chicken's cooking, prepare the avocado sauce. Add all of the avocado sauce ingredients to the bowl of a food processor fitted with the blade attachment. Blend until smooth.
2 ripe avocados, 1 large shallot, 1/4 cup cilantro leaves, 1 small poblano pepper, heaping 1/2 cup sour cream, 2 tsp extra virgin olive oil, 1 lime, 1 1/2 tsp seasoned salt, 1 tsp garlic powder, 1/2 tsp smoked paprika, 1 tsp dried oregano
Carefully open the vent valve on your Instant Pot to perform a quick release as soon as the chicken's done cooking. Add all of the avocado sauce to the Instant Pot, stirring until evenly combined with the chicken and liquid in the pot.
Serve the chicken over steamed white rice with extra cilantro for garnish, if desired.