Turn on the sauté setting on your Instant Pot and add the butter.
Once the butter has melted, add the onions and garlic and sauté for 3-4 minutes.
Add the chicken pieces and sauté for another 3-4 minutes, or until the chicken is lightly cooked on all sides.
Pour the broth and wine into the pot and use a wooden spoon to deglaze the bottom of the pot (scrape up any browned bits that have accumulated on the pot).Add in the rice, cauliflower rice, salt and pepper. Stir to combine.
Place the lid on the Instant Pot and set the valve to the “sealing” position. Set the pressure cooker setting to high pressure for 8 minutes.
Once the timer goes off, let the pressure release naturally for 2 minutes and then do a quick release. I recommend using a long-handled spoon to move the valve so that your hand stays far away from the hot steam that will stream out. When the float valve drops, carefully unlock and remove the lid.
Sprinkle the parmesan over the chicken and rice and stir to incorporate. If the mixture is thicker than you want it, you can thin it out with a little broth or water. If it’s too thin, you can turn on the sauté and allow some of the liquid to evaporate as it cooks. Make sure to stir occasionally so the pieces at the bottom don’t burn. Garnish with parsley if desired before serving.