Preheat oven to 375 degrees. Season chicken with salt and pepper. Heat
oil in a large ovenproof skillet over medium-high heat. Add chicken, top
side down; cook until golden brown, 4 to 5 minutes. Flip; transfer to
oven. Roast until a meat thermometer registers 160 degrees, about 15
minutes. Transfer to a plate; cover.
Place the same skillet over medium heat. Add onion; cook, stirring, 1
minute. Add mushrooms. Cook, stirring occasionally, 3 minutes. Stir in
white wine. Add flour; cook, stirring, 1 mintue. Stir in stock and
chopped parsley; simmer, stirring, until thickened, about 5 minutes. Stir
in cream; season with salt and pepper. Spoon over chicken and serve with
rice.