Add the onion, carrots and celery and cook for two minutes. Add garlic and cook onemore minute.
Add the flour and cook for 1-2 minutes stirring constantly.
Pour the chicken broth in and stir to dissolve flour mixture.
Place the chicken breasts in the broth. Replace cover and lock lid into place, move thepressure valve to sealing position.
Cook on manual pressure cook (high) for 15 minutes. Release pressure by moving thevalve to “vent” when the timer goes off.
Remove the chicken from the instant pot and shred with two forks. Set aside.
Add the gnocchi to the broth and vegetables and set the pressure cooker on “Saute”.Cook the gnocchi according to the package directions, or until it starts to float.
Place the chicken back into the instant pot and add the milk, spinach, salt and pepper.
Turn off the instant pot and let it cool for 5 minutes before serving.