Preheat oven to 350°.
Place a pot of water on the stove and bring the water to a boil.
Peel and chop the potatoes into 1 inch cubes. Once the water is boiling put your potatoes in for 10 to 15 minutes or until the potatoes are soft.
Place potatoes in a large bowl; add sugar, sweet and condensed milk, 3 tablespoons of melted butter, ½ teaspoon salt, and vanilla.
Beat with a mixer at medium speed until smooth. Add eggs; beat well
Pour potato mixture into a 13 x 9 inch baking pan coated with cooking spray.
To prepare topping, combine flour, brown sugar, cinnamon, and ⅛ teaspoon salt; stir with a whisk. Stir in 2 tablespoons melted butter.
Sprinkle flour mixture evenly over potato mixture; arrange pecans evenly over top.
Bake at 350° for 25 minutes or just until golden.
Preheat broiler (remove casserole from oven).
Broil casserole 45 seconds or until topping is bubbly. Let stand a little bit before serving.
