Preheat oven to 375°F. Line a baking pan with parchment or use a Silpat mat.
In a small mixing bowl, combine brown sugar, nutmeg and cinnamon and mix well.
In another medium mixing bowl, add in melted butter and apple slices and toss, making sure each slice gets evenly coated.
Pop open can of crescent roll dough and line each triangle piece on the baking pan. Sprinkle sugar and spice mixture on each triangle evenly and generously.
Place an apple slice at the widest part of the triangle dough and begin to roll, wrapping the apple slice.
Brush each roll with the remaining butter. Optional to sprinkle more sugar/spice mixture over each roll as well.
Bake for 10-12 minutes (until golden brown or according to dough brand instructions).