Preheat oven to 350 degrees. Spray baking dish with non-stick cooking spray and set aside.
Make the Praline Sauce: Melt butter in small saucepan over medium-low heat. Add brown sugar, heavy cream, cinnamon, nutmeg, and sea salt, and stir until mixture is uniform. Bring sauce to a boil then reduce heat to low and simmer for 5 to 10 minutes to allow sauce to thicken. Remove from heat.
¾ cup unsalted butter, 1 cup brown sugar, 1 cup heavy cream, ½ teaspoon cinnamon, ½ teaspoon nutmeg, ½ teaspoon sea salt
Prep the Dish: Meanwhile, peel and slice sweet potatoes.
4 pounds sweet potatoes
Arrange sweet potato slices in baking dish in an overlapping scalloped pattern then pour praline sauce over top.
Bake and Serve: Cover dish with foil then place in oven to bake for 30 minutes. Remove foil and return dish to oven uncovered to bake for another 30 minutes or until sweet potatoes are fork tender and sauce is golden and bubbly.
Garnish with pecan pieces and serve warm.
¾ cup pecan cookie pieces