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Preheat the oven to 350 degrees Fahrenheit. Butter a 2.5-3 quart casserole dish.
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Make 3 cups of sweet potatoes by either baking and mashing or cubing, boiling and mashing. We peeled and cubed 5 sweet potatoes. Boiled until soft and mashed.
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Combine the sweet potatoes, sugar, vanilla, eggs and butter in a large mixing bowl. Mix thoroughly. We used a stand mixer to get it light and fluffy.
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In a separate bowl combine the brown sugar, flour and nuts. Mix. Then slowly pour the melted butter over the mixture and stir until combined.
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Top the sweet potatoes with the sugary nut mixture.
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Bake at 350 degrees for 50 minutes or until the sweet potatoes hit 165 in the center. Let the casserole sit for at least 20 minutes before serving.