01 - 
                Preheat oven to 350°F (175°C). Grease a 9x13-inch baking dish to prevent sticking.
              
              
              
                02 - 
                In a large mixing bowl, combine mashed sweet potatoes, granulated sugar, melted butter, beaten eggs, vanilla extract, and milk. Mix thoroughly until the mixture is smooth and homogenous.
              
              
              
                03 - 
                Spread the sweet potato mixture evenly into the prepared baking dish, smoothing the surface with a spatula.
              
              
              
                04 - 
                In a separate bowl, combine chopped pecans, brown sugar, all-purpose flour, and melted butter. Mix until the topping is uniformly crumbly.
              
              
              
                05 - 
                Evenly sprinkle the pecan mixture over the entire surface of the sweet potato base.
              
              
              
                06 - 
                Bake the casserole for 30 to 35 minutes, or until the topping is golden brown and crisp.
              
              
              
                07 - 
                Allow to cool for several minutes before serving to enhance flavor and texture.