Peel and chop the sweet potatoes into large chunks. Place the chunks in a large saucepan and cover with cold water, bring to a boil and reduce to simmer. Simmer until the sweet potatoes are fork-tender, about 15-20 minutes.
Once the potatoes are tender, remove the pot from the stove carefully. Place a lid over the top at a slant, and carefully pour the water into the sink.
Meanwhile, preheat your oven to 350°F and spray a little cooking spray on 9×9 inch pie plate or casserole dish.
In a mixing bowl, combine the oats, flour, and coconut sugar. Cut in coconut oil with a fork or knife until the mixture is sandy with pea-sized chunks of oil.
Mash the potatoes with a fork or a potato masher until they start to become smooth. Add the almond milk, maple syrup, oil, vanilla, cinnamon, nutmeg, and salt to the bowl. Mix until everything is combined.
Transfer the sweet potato mixture into the prepared dish and sprinkle on the sugar oat topping.
Bake uncovered for 35-40 minutes or until the top is golden brown and the sweet potatoes are bubbling.