Press the 'SAUTE' button, wait until it displays 'HOT'. Add olive oil and let it heat up for a few seconds. Add diced onions, carrots, celery, sauté for 2-3 minutes, or until the onions are translucent.
Add minced garlic, sauté until aromatic.
Next, add seasoning mix. Saute for another 30 seconds.
Make sure you don't have any browned bits stuck at the bottom of the pot to avoid a potential 'BURN' error. If you do, deglaze it with 1/4 cup of stock.
Press 'CANCEL', add mushrooms, rinsed wild rice, and 5 cups stock. Place chicken breasts and thighs in the pot, make sure they are submerged under the stock. Throw in the bay leaves.
Close the lid of the Instant Pot with the valve set to the 'SEALING' position. Press the manual or pressure cook button and pressure cook on high for 30 minutes. It will take some time for the pressure to build up, after which the timer will start.
Once the cooking cycle is complete, let it depressurize for at least 10 minutes, then do a quick release of leftover pressure following the manufacturer's instructions. Once the float valve (silver pin) drops, open the lid. Discard the bay leaves. Transfer the chicken to a cutting board, shred or dice it into small pieces. Set aside.
Turn on the 'SAUTE' button, bring the soup to a boil, add the cornstarch slurry (2 tablespoons of cornstarch mixed with 2 tablespoons of cold water), mix well, stirring continuously, until it turns thick.
Stir in heavy cream, mix well and heat through.
Press 'CANCEL' to switch off the IP. Add roughly chopped spinach, stir until it wilts.
Add the shredded or diced chicken, freshly chopped parsley, ground nutmeg, and lemon juice, mix well. Check for seasoning, adjust with more salt and pepper if required. Dish out, and serve with homemade crusty artisan bread.