Preheat oven to 350°F 

Begin by preparing the potatoes. Peel and rinse the sweet potatoes, then slice into 1/4 to 1/2 inch rounds.

Next, lightly spray a casserole dish with cooking spray and add the sweet potatoes.

Next, prepare the glaze by melting the butter in a sauce pan over medium heat.

Next add the sugars and stir well until combined. 

Next, add the heavy cream and stir to combine. Bring the mixture to a simmer and cook 6-8 minutes. 

Remove the mixture from the heat and add the vanilla, salt and spices. Give a final stir to combine everything together and pour the glaze mixture over the sweet potatoes. 

Cover the casserole dish with aluminum foil and bake for 1 hour.

After 1 hour, carefully remove the aluminum foil and check the potatoes for tenderness.

Bake uncovered an additional 15 to 20 minutes, or until the potatoes are tender if needed.