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Preheat oven to 350 degrees.
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In a large mixing bowl, mix together the softened sweet potatoes, dark brown sugar, milk, butter, and eggs with a handheld or a stand mixer on medium-speed. Spread the mixture into a 9x13 baking dish, making sure it's even.
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Prepare the topping by mixing together the dark brown sugar, flour, melted butter, bourbon, and chopped pecans in a small bowl. Spread over the top of the sweet potato mixture. Bake for 30 minute, add the marshmallows on top then bake for another 5-10 minute, or until the marshmallows are lightly browned.