Combine the seasoning mix ingredients in a small bowl. Set aside.
Heat the vegetable oil in a large nonstick skillet over MEDIUM-HIGH heat. Add half of the meat and sprinkle it with 2 teaspoons of the spice mixture. Sauté until golden brown, about 3 to 4 minutes. Use a slotted spoon to transfer the chicken to a 6-quart slow cooker. Add a little additional oil to the pan, if needed, and repeat with the remaining chicken and an additional 2 teaspoons of the seasoning mix. Reserve the remaining spice mixture for later. Transfer the 2nd batch of chicken to the slow cooker.
Add additional oil to the empty pan, if needed, and add the onion, celery, and garlic. Cook, stirring occasionally, just until softened. Add the tomato paste and stir until well combined. Add the white wine and increase the heat under the pot to bring the mixture to a boil, stirring to scrape up any bits from the bottom. Then, pour/scrape the mixture into the slow cooker with the chicken.
Add the broth then layer the potatoes and carrots over the top and sprinkle the remaining seasoning mix over the top, but don’t stir. Finally, tuck the bay leaves into the liquid. Cover and cook on LOW for 4 to 5 hours, or until the chicken and vegetables are tender. (As the stew cooks, the liquid level will rise and everything will eventually be immersed and cook perfectly).
Set the slow cooker to HIGH. In a small bowl, whisk together the water and cornstarch and stir it into the stew. Add the peas and parsley. Cover and continue to cook for 15 to 20 minutes or until slightly thickened, stirring once or twice. Remove and discard the bay leaves and serve.