Coat a medium-sized casserole dish with nonstick spray
Combine sweet potatoes, sugar, salt, vanilla, eggs and butter in a large mixing bowl in the order listed. Beat thoroughly with a hand mixer to increase the fluffiness of the sweet potato mixture.
Pour mixture into the baking dish. Bake for 30 minutes. (At this point, dish can be covered and refrigerated.)
Sprinkle the surface of the sweet potato mixture evenly with the crust mixture and return to oven for 10 minutes. Allow to set at least 30 minutes before serving.