Söt Potatiskassel

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1. 1
   Gather and prep all ingredients. Grease a 9x9 baking dish and preheat the oven to 350°F (177°C).
2. 2
   Boil cubed sweet potatoes in salted water until fork-tender, about 12-15 minutes. Drain.
3. 3
   Mash sweet potatoes until smooth.*
4. 4
   Add in 4 Tbsp (¼ cup) butter, milk, eggs, ¼ cup brown sugar, cinnamon, salt, and vanilla until smooth. Spread evenly in the prepared baking dish.
5. 5
   In a small bowl, combine the pecans, flour, and remaining ¼ cup brown sugar. Pour in the remaining ¼ cup melted butter, and stir until a sandy, crumbly consistency forms.
6. 6
   Sprinkle the pecan streusel evenly over the sweet potato layer.
7. 7
   Bake uncovered for 25-30 minutes, until the topping is golden and the casserole is set.
8. 8
   Allow to cool slightly before serving.