Preheat the oven to 375 degrees Fahrenheit and place the rack in the center of the oven.
Peel and cut sweet potatoes into halves or fourths with a sharp chef's knife.
Place sweet potatoes into a large pot and cover with water. Boil for about 6-9 minutes checking occasionally by poking with a fork. You want the sweet potatoes to be fork-tender. Remove and drain potatoes and put into a large bowl.
Add almond milk, melted coconut oil, egg, and salt. Use a hand mixer to blend or you can mash with a hand potato masher. You could also use a food processor for this but not necessary.
Spray a 9 x 13-inch baking dish with non-stick cooking spray and add the sweet potato mixture. Spread the filling evenly in the greased casserole dish.
In a small bowl make the pecan topping by mixing the quick oats, almond flour, pecans, and maple syrup. Spread evenly over the top of the casserole.
Bake at 375 degrees Fahrenheit for about 17-20 minutes or until the topping turns golden. You can place on a baking sheet if you are worried about it spilling over into your oven.
Serve immediately with a drizzle of pure maple syrup.