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Chicken and stuffing casserole flips the traditional recipe upside down: letting chicken thighs roast atop herbed stuffing, so it soaks up all that delicious flavor.
Prepare oven and baking dish: Heat oven to 375°F. Place an oven rack in the center of the oven. Spray a 9- x 13-inch baking dish with nonstick spray, or line with aluminum foil.
Make stuffing: Prepare the boxed stuffing mixes according to package directions, using 4 Tbsp. butter and 2 1/2 cups of water instead. Set aside to cool for 10 minutes. Fold in the still-frozen vegetables, salt, and pepper.
Marinate chicken: In a small bowl, melt the remaining 4 Tbsp. butter. In a large bowl, mix the herbes de Provence and mustard powder with butter. Toss chicken thighs in butter-herb mixture until fully coated.
Add stuffing to baking dish: Pour the stuffing and vegetable mix in the prepared baking dish, and spread out evenly.
Bake casserole: Arrange chicken thighs, skin-side up, on top of the stuffing. Bake for 45 minutes to 1 hour, until the thighs register 175°F on a meat thermometer, and the stuffing registers 185°F. Rotate the pan halfway through cooking to ensure even browning. Serve hot.