Set the Instant Pot to saute. Add butter and onion and cook until transparent. Add garlic and cook for 1 more minute. Add frozen veggies, seasoning, chicken breasts and stock. Close the lid. Cook for 12 minutes on high pressure. Manually release steam.
In a small bowl combine milk and cornstarch. Incorporate it to the soup and, with the Instant Pot on warm, let it thicken (around 5 minutes). Meanwhile, with the help of two forks, shred the chicken.
Turn off the Instant Pot and mix in the heavy cream.
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