Heat the butter and olive oil in a frying pan over medium-high heat until they shimmer. Add the diced carrots and celery. Cook for 3 minutes. Add minced onions and cook until the onion is translucent, about 3 minutes. Add the minced garlic and cook 30 seconds. Add the cubed, cooked chicken, diced mushrooms, and peas. Cook for 1 minute. Sprinkle the all-purpose flour and cook 3 minutes, stirring continuously. Stir in the chicken stock and scrape the bottom of the pan to deglaze the pan. Pour in the white wine (Chablis) and heavy cream. Stir well. Add the Dried thyme, Greek oregano, salt and pepper (Season to Taste). Stir well and continue to cook until thickened to a thick-stew consistency.
2 oz butter, 2 Tbsp olive oil, 2 carrots, 2 celery ribs, 1 sweet onion, 2 Garlic Cloves, 15 oz leftover chicken, 4 oz button mushrooms, 5.11 oz frozen peas, 1.69 oz all-purpose flour, 16.93 oz Chicken Stock, 2.12 oz white wine, 8.47 oz heavy cream, 1/2 tsp Dried thyme, 1/4 tsp Greek oregano, Salt, Pepper