Set the Instant Pot to the sauté function. Add olive oil. Once hot, add cubed chicken. Sear for 2-3 minutes until lightly browned (it doesn’t need to be cooked through). Remove and set aside.
Add onions, celery, and carrots to the pot. Sauté for 3-4 minutes until softened. Stir in garlic and cook for 1 minute.
Sprinkle flour over the vegetables and stir to coat evenly. Cook for 1 minute to remove the raw flour taste. Gradually add chicken broth while stirring, scraping any browned bits from the bottom of the pot.
Return the chicken to the pot. Add potatoes, thyme, salt, and pepper. Stir to combine.
Close the lid and set the valve to sealing. Cook on High Pressure for 10 minutes. Allow for a 10-minute natural pressure release, then manually release any remaining pressure.
Stir in frozen peas and heavy cream, let them warm in the residual heat for 2-3 minutes. Adjust seasoning to taste and serve.
Stove Top:
Heat olive oil in a large pot over medium heat. Sear cubed chicken for 2-3 minutes until lightly browned. Remove and set aside.
Add onions, celery, and carrots to the pot. Sauté for 3-4 minutes, then stir in garlic and cook for 1 minute.
Sprinkle flour over the vegetables and stir to coat. Gradually add chicken broth, stirring to combine.
Return chicken to the pot, then add potatoes, thyme, salt, and pepper. Stir to combine.
Bring to a boil, then reduce heat to low. Cover and simmer for 30 minutes, stirring occasionally, until chicken and potatoes are tender.
Stir in frozen peas and heavy cream, cook for another 5 minutes. Adjust seasoning to taste and serve.
Deglaze the pot well: After sautéing the vegetables and adding the broth, scrape the bottom of the Instant Pot thoroughly to release any browned bits and help prevent a burn notice.
Add cream at the end: Stirring in the heavy cream after pressure cooking keeps the stew smooth and prevents curdling.
Cut ingredients evenly: Keeping the chicken and potatoes similar in size helps everything cook evenly.
Let it rest briefly: Allowing the stew to sit for a few minutes after cooking helps it thicken slightly before serving.