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Preheat the oven to 325 F and butter a 2-quart baking dish.
Mix the mashed sweet potatoes, 5 tablespoons of butter, and 1/4 cup of brown sugar until well blended. Whisk in the eggs, milk, vanilla, and salt.
Spoon the sweet potato mixture into a greased 2-quart baking dish.
Prepare the Topping
Combine the melted butter, brown sugar, flour, and a dash of salt in a medium bowl. Stir until the mixture forms clumps, then incorporate the pecans.
Sprinkle the pecan mixture over the sweet potato filling and bake for 30 to 40 minutes or until set.
The time estimate includes 15 minutes for boiling cubed sweet potatoes.