Preheat the oven to 350 F and spray a 2 quart casserole dish with non-stick spray (or wipe with olive oil).
Mash the sweet potatoes (with the margarine, if you’re using it) until smooth. Add the soy creamer, orange juice, vanilla, sugar, maple syrup, salt, nutmeg and cinnamon. Pour into prepared casserole dish.
Mix the topping ingredients together until well-combined. Spread or sprinkle over the casserole and bake for 45 minutes or until hot throughout.