1. Preheat oven to 350 degrees. Spray a 9 x 13 inch baking dish with cooking spray.
2. In a large bowl, mix together mashed sweet potatoes, 1/2 C. 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.
3. Bake for 25 minutes in the preheated oven, or until golden brown.
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