01 - 
                Preheat oven to 350°F (175°C). Coat a 9×13-inch baking dish with nonstick cooking spray.
              
              
              
                02 - 
                Place sweet potatoes in a large pot, cover with water, and bring to a boil. Cook until fork-tender, about 15 to 20 minutes.
              
              
              
                03 - 
                Drain sweet potatoes thoroughly and allow to cool slightly. Transfer to a mixing bowl and mash until smooth.
              
              
              
                04 - 
                Add melted butter, maple syrup, brown sugar, ground cinnamon, ground nutmeg, and a pinch of salt to the mashed sweet potatoes. Stir until mixture is uniformly combined.
              
              
              
                05 - 
                Spread sweet potato mixture into the prepared baking dish, smoothing the top evenly.
              
              
              
                06 - 
                Sprinkle chopped pecans over the surface. Top with mini marshmallows if desired.
              
              
              
                07 - 
                Bake for 25 to 30 minutes, until heated through and the surface turns golden brown.