Preheat the oven to 400 degrees F (200 degrees C). Prick potatoes several times with a fork and place on a baking sheet.
Bake potatoes in the preheated oven until you can easily pierce them halfway through with a sharp knife, about 1 1/2 hours. Remove from the oven and allow to cool until easily handled, at least 20 minutes. Leave the oven on.
Meanwhile, mix brown sugar, 1/2 cup butter, pecans, and pumpkin pie spice for topping in a bowl until thoroughly combined.
Peel the cooled sweet potatoes and cut crosswise into 3/4-inch thick slices.
Lightly grease a 9x13-inch ceramic or glass baking dish with 2 teaspoons butter. Spread potato slices in a single layer in the dish and spoon a bit of topping over each slice. Add remaining potato slices in a second layer and sprinkle with remaining topping.
Bake, uncovered, in the preheated oven until bubbly and browned, about 20 minutes. Use a serving spoon to dish this out, making sure to get to some of the sauce from the bottom for each serving.
Nutritional Facts
Per 12 servings
Calories: 308
Carbohydrate: 49g
Fat: 12g
Fiber: 5g
Protein: 3g
Sugar: 24g
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