Prepare the Stuffing: In a medium bowl, combine the boiling water and unsalted butter. Stir until the butter is melted. Add the stuffing mix and stir well to combine. Cover the bowl and let the stuffing stand for about 5 minutes to absorb the liquid and become fluffy.
1 6-ounce packaged stuffing mix*, 1 1/2 cups boiling water, 2 Tablespoons unsalted butter
Prepare the Chicken: While the stuffing rests, preheat your oven to 375°F (190°C). Butterfly each chicken breast by slicing horizontally, but not all the way through, to create a pocket. Be careful not to cut through the other side.
4 boneless skinless chicken breasts, about 2.5 pounds*
Season the Chicken: Rub the olive oil all over the chicken breasts, both inside the pockets and on the outside. In a small bowl, mix salt, black pepper, brown sugar, dried mustard, garlic powder, onion powder, smoked paprika, rosemary, and oregano. Sprinkle and rub this spice mixture over the oiled chicken breasts.
1 Tablespoon olive oil, 1 1/2 teaspoons Morton kosher salt*, fresh cracked black pepper, 1 Tablespoon brown sugar, 1 teaspoon EACH dried mustard, garlic powder, onion powder, smoked paprika, rosemary, & oregano
Add Parmesan: Fold the shredded Parmesan cheese into the prepared stuffing, mixing until evenly distributed.
1/2 shredded parmesan cheese
Stuff the Chicken: Spoon the stuffing mixture into each chicken breast pocket, dividing it evenly among the four breasts.
Bake the Chicken: Place the stuffed chicken breasts in a baking dish. Bake in the preheated oven for about 30 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (74°C). For a golden brown finish, spray the chicken with oil and broil for the last 5 minutes, keeping a close eye to avoid burning. Let the chicken rest for a few minutes before serving.