Bring sweet potatoes to a boil in a large pot of lightly salted water, covered, for 15 to 20 minutes, until tender. Drain and return potatoes to the pot and set aside.
While your potatoes are boiling, in a large over medium heat drizzle olive oil, add apple wedges in a single layer and sprinkle with brown sugar.
Cook for about 20 to 25 minutes until apples are tender and caramelized, turning frequently.
Mash potatoes with an electric mixer on low speed until smooth.
Gradually add broth, beating to make potatoes light and fluffy. Season with salt, pepper, nutmeg and cinnamon. Cook and stir over medium heat until heated through.
In a small skillet, drizzle a bit of olive oil until hot, but not smoky. Fry rosemary leaves for about 45 seconds until crispy.
Remove with a slotted spoon and top sweet potatoes with caramelized apples and crisp rosemary. Enjoy!