In a large skillet, melt butter over medium heat. Add onion, bell pepper, and garlic. Cook until vegetables are tender, about 3 minutes. Whisk in flour; cook, whisking constantly, for 1 minute. Gradually whisk in stock, wine, and cream; bring to a boil. Reduce heat to medium-low; stir in 1 cup cheese, salt, poultry seasoning, and pepper until cheese is melted and sauce is thickened, about 5 minutes. Stir in chicken, rice, peas, and parsley. Spoon mixture into an 11×7-inch baking dish. Sprinkle with remaining ½ cup cheese.
Bake until bubbly and lightly browned, about 25 minutes. Let stand for 10 minutes before serving. Garnish with parsley, if desired.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/cheesy-chicken-rice-casserole/