Add chicken, celery, carrots, water, bouillon, rices, pepper, salt, parsley, sugar, garlic powder, and thyme to Instant Pot
Lock the lid into place. Make sure valve is set to sealing. Push the manual high pressure button and set the timer to 25 minutes.
When the timer beeps let the pressure release naturally for 10 minutes and then move the valve to "venting" to release the rest of the pressure.
Remove the lid. Remove the chicken and shred it or cut into pieces. Put the chicken back into the pot.
Melt the butter (in glass bowl or measuring cup in the microwave). Stir into the flour, a tablespoon at a time. It will make a cookie dough consistence.
Ladle in a cup of the broth of the soup and stir until creamy. Turn the Instant Pot to the saute setting. add the mixture to the Instant Pot and stir. The soup will thicken up. While it's thickening, stir in the half and half