In a small bowl, combine brown sugar, chopped pecans, flour, and butter for the crumb topping. Set aside.
Casserole
Beat the mashed sweet potatoes, granulated sugar, milk, melted butter, eggs, vanilla, salt, ground cinnamon, ground nutmeg, and ground ginger until smooth. Spread in a greased, shallow casserole dish.
Cover evenly with the crumb topping.
Bake at 350˚F for 30-35 minutes until golden brown and heated through.
Video
Notes
One: Make Ahead
Mix the crumb topping and put it in a zip-top bag. Beat the sweet potato mixture, spread in the casserole dish, cover, and store in the fridge overnight. When ready to bake, add the crumb topping.
Two: With Marshmallows and Pecans
After 30 minutes of baking remove the casserole from the oven and top it with mini marshmallows. Return it to the oven to melt and toast the marshmallows.
Three: Storage
Cover leftovers and store them in the fridge for 3-4 days.