Preheat your oven to 350°F (175°C).
Peel the sweet potatoes and cut them into 1-inch thick rounds or cubes, ensuring they are of uniform size for even cooking.
In a large pot, combine the water, brown sugar, butter, cinnamon, nutmeg, vanilla extract, and salt. Heat over medium heat until the butter is melted, stirring occasionally.
Add the sweet potatoes to the pot and stir to coat them evenly with the glaze.
Transfer the sweet potatoes and the glaze into a greased baking dish, arranging the sweet potatoes in a single layer if possible.
Cover the baking dish with aluminum foil to prevent the sweet potatoes from drying out.
Bake in the preheated oven for 30 minutes. After 15 minutes, remove the foil and gently stir the sweet potatoes.
After 30 minutes, check the sweet potatoes for tenderness. If necessary, return them to the oven uncovered for an additional 5-10 minutes, checking frequently.
Once done, serve warm as a delicious side dish.