01 -
Preheat oven to 400°F (200°C). Prick sweet potatoes several times with a fork and place on a baking sheet.
02 -
Bake until potatoes are easily pierced with a knife, approximately 1 hour 30 minutes. Let cool at least 20 minutes. Keep oven on.
03 -
Combine dark brown sugar, ½ cup softened butter, chopped pecans, and pumpkin pie spice in a bowl; set aside.
04 -
Peel sweet potatoes and cut crosswise into ¾-inch thick slices.
05 -
Lightly grease a 9x13-inch baking dish with 2 teaspoons softened butter. Arrange half of the sweet potato slices in a single layer. Spoon half of the topping evenly over the slices. Add remaining potato slices and top with the rest of the topping.
06 -
Bake uncovered in the preheated oven until bubbly and browned, about 20 minutes. Serve with pan sauce.