Mix remaining ingredients together in a bowl and pour over chicken breasts.
Cook on HIGH for 3-4 hours or LOW 6-8 hours.
Shred chicken and serve with pocketless pita bread, sliced tomatoes, sliced onions, sliced cucumbers, lettuce, and Tzatziki sauce.
Instant Pot Gyros
In a gallon-sized resealable bag, add chicken, garlic, lemon juice, onion, olive oil, red wine vinegar, oregano, allspice, and lemon pepper.
Mix well so that all the chicken is covered in marinade.
Let marinate in fridge for at least 2-3 hours (6-8 is ideal for best flavor).
When chicken is finished marinating, pour 1 cup of chicken broth into the bottom of the Instant Pot.
Dump the entire contents of the bag (chicken and marinade) into the Instant Pot.
Place lid on pot and press MANUAL (or PRESSURE COOK) and set timer for 10 minutes.
Allow 10-15 minutes to come to pressure before it starts the countdown cook timer.
Once it is finished cooking, do a natural release of the pressure for 5-10 minutes and then a quick release of the remaining pressure. Remove the lid.
Shred cooked chicken using 2 forks.
Tzatziki Sauce Instructions
Shred or grate the cucumber and blot with a paper towel to get rid of as much moisture as possible.
Mix together the yogurt, shredded cucumbers, garlic, vinegar and lemon juice. Add dill and salt and pepper to taste.
Keep in the fridge until serving (it's best if you let the flavors come together for about 30 minutes before serving).
Serve on pita bread topped with cooked chicken, cucumbers, lettuce, tomato, and homemade tzatziki sauce.
Notes
Instant Pot preparation time includes the following: 2 hours to prepare, 10 minutes cook time, 10 minutes pressurize time, for a total of 2 hours and 20 minutes.
Homemade tzatziki is really easy to make, but store bought tzatziki is great as well.
You can also use ranch or cucumber ranch dressing in place of the tzatziki.
Serve this with hummus, pita chips, and fresh vegetables for dipping in the hummus.