Preheat oven to 375 °F.
Mix sugar, salt, cinnamon and nutmeg in a small bowl and set aside.
Saute butter and maple syrup in a large pan, and bring to a boil.
Remove from heat. Add nuts and toss to coat.
Transfer nuts to a rimmed baking sheet lined with aluminum foil.
Sprinkle with sugar mixture over top of the nuts and toss gently to coat; DO NOT MIX too much because the sugar will dissolve and won't stick to the top of your nuts.
Cook in the oven at 375 °F. It should take about 5-10 minutes. Be sure not to overcook, as the nuts will darken slightly after being removed from the oven.