Add onion and the mixed veggies to the melted butter, then saute until the onion is translucent.
Remove the veggies from Instant Pot and set them aside.
Add 1/2 cup chicken broth to Instant Pot and stir to deglaze the pot.
Add chicken (thawed) and spices to Instant Pot, then secure the lid.
Push the Poultry Button, then set the timer to 15 minutes.
The Instant Pot will come to pressure then begin to count backward from 15.
Allow a Natural Pressure Release for 6 minutes after the 15-minute cook cycle is complete, then do a quick pressure release. (I cover the valve with a kitchen towel to avoid the spray from the liquid.)
Shred chicken in the pot with two forks, then add veggies back to the Instant Pot.
Add the remaining chicken broth, heavy whipping cream, and cream cheese.
Turn Instant Pot to saute and bring soup to a boil for 6 minutes.
Turn Instant Pot to keep warm, then sprinkle Xanthan Gum on top. Stir and allow the mixture about 10 minutes to thicken.
Cook 1 to 1½ lbs chicken and spices in the Crock-Pot in 1 cup chicken broth for 3 hours on high or 6 hours on low.
With two forks, shred the chicken and leave it in the Crock-Pot.
Sautee onion, mixed veggies, garlic cloves, salt, and pepper in 2 tablespoons butter in a skillet on the stove for approx 5 min or until onions are translucent, then add to the chicken in the Crock-Pot.
Add heavy whipping cream, the rest of the chicken broth, and cream cheese to Crock-Pot. Cover with lid, and cook on high for 45 minutes.
Remove lid, and turn Crock-Pot to warm. Then, sprinkle Xanthan Gum on top and allow soup to thicken for 15-20 minutes.