2poundsboneless, skinless chicken breasts (about 4 small/medium or 3 medium/large), cut in half if large
1small yellow onionor 1/2 large yellow onion, thinly sliced
3chipotle peppers in adoboindividual peppers, NOT 3 cans, finely chopped (if you love heat, feel free to add an extra pepper or stir in a few teaspoons of sauce from the can)
1candiced tomatoes in their juices(14 ounces)
1/4cupfreshly squeezed lime juicefrom about 1 medium lime
FOR THE AVOCADO SAUCE:
1ripe avocadopeeled and pitted
3/4cupnonfat plain Greek yogurt
2-4tablespoonsfresh lime juice
Tortillas or taco shells of your choice
Any other bonus toppings: fresh cilantrodiced jalapeno, thinly sliced radishes, cheese, additional salsa, diced avocado (either in place of or in addition to avocado sauce above)
Season both sides of the chicken with 1 teaspoon kosher salt and black pepper.
Set the Instant Pot to sauté. Heat 1/2 tablespoon of the olive oil. Once hot and shimmering, add half the chicken and sear both sides for 2 to 3 minutes each, just until brown (the chicken does not need to be cooked through). Do not disturb the chicken while each side sears. Remove to a plate and set aside. Add the second half of the chicken and sear each side for 2 to 3 minutes each. Remove to the same plate.
With the Instant Pot still on sauté, add the remaining 1/2 tablespoon olive oil. Add the onion, garlic, chili powder, and remaining 1/2 teaspoon kosher salt. Let cook 3 minutes, until the onion beings to soften. Turn the Instant Pot off (on my model, I hit CANCEL). Stir in the chipotle peppers, tomatoes, and reserved chicken. Arrange the chicken pieces in a single layer (a little overlap is OK, and the chicken will be touching). Pour the lime juice over the top.
Lock the lid in place. Cook on manual pressure for 8 minutes. As soon as the time is up, vent immediately. Once you can open the lid, turn the Instant Pot off, and then remove the chicken to a large bowl or plate. Turn the Instant Pot to SAUTE. Bring the cooking liquid to a simmer. Let simmer for 5 to 10 minutes, stirring occasionally, until the liquid reduces by about half. Meanwhile, shred the chicken with two forks (or, once it is cool enough, your fingers).
Once the liquid is reduced, turn the Instant Pot off, return the chicken into the Instant Pot, and then stir the chicken to coat in the sauce.
Prepare the avocado sauce (I like to do this while the chicken is pressure cooking): In a food processor, blend together the avocado, Greek yogurt, 2 tablespoons lime juice, and salt until smooth. Taste and add additional salt or lime juice as desired.
To serve: Fill the shells or tortillas with the chicken, drizzle with avocado sauce, and add any desired toppings. Enjoy immediately.
Store leftover chicken in an airtight container in the refrigerator for up to 4 days or freeze for up to 3 months. Let thaw overnight in the refrigerator. Reheat gently on the stove with a splash of chicken stock or extra salsa to keep it from drying out.
Leftover avocado sauce can be refrigerated in an airtight container or mason jar (press a piece of plastic wrap over the top to protect it from air) for up to 2 days.
Serving: 1taco (in hard shell), with 2/3 cup shredded chicken and 2 tablespoons sauce (no additional toppings)Calories: 251kcalCarbohydrates: 15gProtein: 26gFat: 10gSaturated Fat: 3gCholesterol: 56mgFiber: 4gSugar: 3g
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