Twice Baked Sweet Potatoes

Name: Twice-Baked Sweet Potatoes
Ingredients: 8 medium sweet potatoes (10-12 ounces each); 1 tablespoon canola or sunflower oil; ½ cup finely grated Parmesan cheese, divided; ⅓ cup sour cream; 2 tablespoons pure maple syrup; 1 teaspoon salt; ½ teaspoon ground pepper; ½ teaspoon freshly grated or ground nutmeg; Fried baby kale leaves for garnish (see Tip)