Preheat a convection oven to 375°F (190°C) and grease a 9x13 inch ceramic baking dish.
In a stainless steel mixing bowl, whisk together melted butter, honey, cinnamon, nutmeg, salt, and rosemary until emulsified.
Arrange the sweet potato slices and apple wedges in the prepared dish, alternating them in an overlapping shingle pattern.
Uniformly drizzle the honey-butter glaze over the potatoes and apples.
Cover the dish tightly with heavy-duty aluminum foil to trap steam and bake for 30 minutes.
Remove the foil, baste the surface with the accumulated juices, and sprinkle with chopped pecans.
Return to the oven uncovered for 20 minutes or until the sweet potatoes reach an internal temperature of 205°F and the glaze has caramelized.
Allow the dish to rest for 5 minutes at room temperature to set the glaze before service.