Start by seasoning your chicken thighs with sea salt, pepper, and garlic powder. Make sure each piece is evenly coated for maximum flavor.
Set your Instant Pot to the sauté mode. Add the olive oil and 1 tablespoon of butter. Once the butter is melted, add the chopped onion and sauté for about 2-3 minutes until translucent. Then, add the minced or sliced garlic and Italian seasoning, cooking for an additional minute until fragrant.
Add the seasoned chicken thighs to the pot, browning them on each side for about 3-4 minutes. This step is optional but adds depth to the flavor.
Pour in the lemon juice, lemon zest, and chicken broth. Scrape up any browned bits from the bottom of the pot to prevent a burn notice.
Secure the lid on the Instant Pot and set it to pressure cook on high for 10 minutes. Once the cooking time is complete, allow for a natural release for 5 minutes before performing a quick release.
Remove the chicken from the pot and set it aside. Turn the Instant Pot back to sauté mode and add the remaining 2 tablespoons of butter. Stir until melted, allowing the sauce to reduce slightly for about 5 minutes.
Return the chicken to the pot, coating it in the buttery lemon garlic sauce. Garnish with chopped fresh parsley and lemon slices before serving. Enjoy this flavorful dish over rice, pasta, or with a fresh salad!