To the Instant pot, add the chicken broth, onion, broccoli, carrots, garlic, salt and pepper.
Set to manual for 2 minutes. Allow a natural pressure release for 3 minutes then manually release the remaining pressure.
Remove lid and stir in the heavy cream. Turn on to saute and heat until it almost begins to simmer. Turn the Instant Pot to off. Stir in the cheese. Ten mix the cornstarch and water together. Slowly stir it to the soup until thickened. Serves 4.