In a small bowl, combine the melted butter, flour, sugar, and maple syrup.
Mix well and stir in the pecans. Set aside.
Steam or boil the sweet potatoes until soft.
Mash the sweet potatoes with a potato masher. Stir in the butter, milk, orange juice, vanilla, sugar, maple syrup, salt, nutmeg and cinnamon.
Put the mashed sweet potatoes in a casserole dish sprayed with cooking spray.
Spread the pecan mixture over the top of the casserole. Bake in a preheated 350 degree oven for 45 minutes or until the casserole is heated through.