Sweet Potato Casserole

This has been in my family as long as I can remember. Found this recipe in some of my mom's notes after she passed, so not sure where it come from.

• Ready In: 45 mins
• Serves: 8-10

Ingredients

• 3  cups  cooked mashed sweet potatoes
• 1  cup sugar
• 2  eggs
• 1  teaspoon vanilla extract
• 1⁄3 cup milk
• 1⁄2 cup butter or 1⁄2 cup margarine
• 1  cup  firmly packed brown sugar
• 1⁄3 cup all-purpose flour
• 1⁄3 cup butter or 1⁄3 cup margarine
• 1  cup pecans, finely chopped

Directions

1. Combine sweet potatoes, sugar, eggs, vanilla, milk and 1/2 cup butter; beat with electric mixer until smooth.
2. Spoon into a greased 2-quart shallow casserole.
3. Combine brown sugar, flour, 1/3 cup butter, and pecans; sprinkle over top of casserole.
4. Bake at 350 degrees for 30 minutes.