Prep the Ingredients – Dice all the vegetables and cut the chicken into bite-sized pieces.
Sauté the Aromatics & Chicken – In a large pot or Dutch oven, heat the butter and olive oil over medium heat. Cook the onion, garlic, celery, and carrots until softened. Add the chicken, season with the ranch seasoning, Italian seasoning, salt, and pepper, and cook until lightly golden.
Make the Base – Sprinkle the flour over the chicken and stir to coat. Stir in the chicken broth and homemade cream of chicken soup, then add the potatoes, green beans, thyme, and bay leaf.
Simmer Until Tender – Bring the stew to a gentle boil over medium-high heat, then reduce the heat to low. Cover and simmer for 25–30 minutes, stirring occasionally, until the chicken is cooked through and the vegetables are tender.
Finish & Serve – Stir in the heavy cream and frozen peas and simmer for 5 more minutes, until heated through. Remove the bay leaf, adjust the seasoning, and serve warm topped with grated Parmesan cheese. Enjoy!