Preheat the oven to 350°F.
Arrange the sliced apples evenly in the bottom of a large baking dish.
Sprinkle the apples with 1/2 teaspoon cinnamon and 1/4 teaspoon nutmeg.
Place the boneless pork chops in a single layer over the sliced apples.
Season the pork chops generously with kosher salt and freshly ground black pepper.
In a medium saucepan over medium-high heat, combine the unsalted butter and brown sugar.
Whisk until the butter is fully melted and the brown sugar is incorporated.
Stir in the remaining 1/2 teaspoon cinnamon and 1/4 teaspoon nutmeg.
If a thicker glaze is desired, whisk in the cornstarch until fully combined and smooth.
Pour the butter and brown sugar mixture evenly over the pork chops and apples.
Transfer the baking dish to the preheated oven.
Bake for 35 to 40 minutes, or until the pork chops are cooked through and tender.
For best results, ensure the pork reaches an internal temperature of 145°F.
Remove the baking dish from the oven.
Sprinkle the pork chops with minced fresh rosemary.
Serve warm with the baked apples and glaze spooned over the top.