Turn the Instant Pot to the sauté setting. Add olive oil and allow it to heat. Add diced chicken and sauté for about 5-7 minutes, until browned and cooked through. Season with salt and pepper. Remove chicken and set aside.
In the same pot, add minced garlic and sauté for 1 minute until fragrant, stirring constantly to prevent burning.
Pour in the chicken broth and scrape up any browned bits from the bottom of the pot. Add fettuccine pasta, ensuring the pasta is submerged in broth.
Close the lid of the Instant Pot and set the valve to sealing. Cook on high pressure for 6 minutes. Once finished, quick-release the pressure.
After the pressure is released, carefully open the lid. Stir in the heavy cream, Parmesan cheese, cooked chicken, and Italian seasoning. Mix until the cheese is melted and the sauce is creamy. Adjust seasoning with salt and pepper as needed.
Spoon the pasta into bowls and garnish with chopped parsley.
Notes
Adjust seasoning to taste and garnish with parsley for added flavor.