- Preheat oven to 350
- Grease a 9x13 inch baking dish.
- In a large bowl, mix together mashed sweet potatoes, 1/2 cup butter, milk, sugar, vanilla extract, and eggs. Spread sweet potato mixture into the prepared baking dish.
- In a small bowl, mix together brown sugar and flour. Cut in 1/3 cup butter until mixture is crumbly, then stir in pecans.
- Sprinkle pecan mixture over the sweet potatoes.
- Bake for 25 minutes in the preheated oven, or until golden brown.