Generously rub each chicken thigh with salt, black pepper, and dried oregano. Ensure all sides are evenly coated for maximum flavor.
Power on your Instant Pot and select the 'Sauté' mode. Add the olive oil, allowing it to heat until shimmering. Carefully place the seasoned chicken thighs skin-side down into the pot. Sear for about 5 minutes until the skin is crispy and golden brown. Flip the thighs and continue browning the other side for an additional 5 minutes. Once browned, remove the chicken from the pot and set aside on a plate.
With the pot still on, add the minced garlic to the leftover oil and sauté for approximately 30 to 60 seconds. Stir constantly until fragrant, taking care not to let it burn as this can impart a bitter flavor.
Pour in the chicken broth, using a wooden spoon to scrape up any browned bits stuck to the bottom. These bits are packed with flavor, so make sure they are incorporated into the broth.
Stir in the fresh lemon juice and zest, mixing thoroughly with the broth. This will infuse the sauce with a bright, zesty flavor.
Return the seared chicken thighs to the Instant Pot, ensuring they are submerged in the flavorful liquid. Close the lid, set the valve to sealing, and select 'Manual' or 'Pressure Cook' mode. Set the timer for 12 minutes.
After the cooking time has elapsed, let the pressure release naturally for about 10 minutes. Then, carefully switch the valve to venting to release any remaining steam.
Once safe to do so, remove the chicken thighs from the pot. Allow them to rest on a plate for a few moments. For a thicker sauce, you can switch the Instant Pot back to 'Sauté' mode and let the sauce simmer until reduced to your desired consistency.
Plate the chicken thighs and generously drizzle them with the aromatic sauce from the pot. Sprinkle with freshly chopped parsley for a touch of color and flavor.
Notes
For a thicker sauce, simmer the sauce after cooking.