Preheat oven to 350 and grease 9x13 baking dish with non stick spray.
Drain sweet potatoes and put potatoes into mixing bowl. Mash well and mix in 4 tbsp melted butter butter, milk, sugar and eggs. Spread sweet potato mixture into the prepared baking dish.
In a small bowl, mix together brown sugar and flour. Cut in 4 tbsp butter until mixture is crumbly, then stir in pecans. Sprinkle pecan mixture over the sweet potatoes.
Bake for 25 minutes.
Bonus Option - You can add a tsp of vanilla and cinnamon for additional flavor.