Preheat the oven to 375 degrees F. Spray a 9x13-inch baking pan with non-stick cooking spray, set aside.
Peel and cut sweet potatoes into ½ inch thick slices. Place the potatoes into the baking dish and sprinkle with the salt, set aside.
In a small saucepan, add the butter, brown sugar, molasses, cinnamon, nutmeg, and ginger. Place on the stove over medium-low heat, stir occasionally. Bring to a simmer, simmer for 2 minutes stirring occasionally.
Pour mixture over the potatoes making sure all the exposed potatoes are covered in the sauce.
Cover with foil, bake for 30 minutes.
Take the foil off, stir, and bake uncovered for an additional 30 minutes.
Let cool for 10 minutes before serving. Liquid will thicken as it cools.