Peel and dice the
sweet potatoes into bite size cubes and place in the baking dish.

Melt butter in the microwave and
pour over the potatoes along with the olive oil, brown sugar, cinnamon, nutmeg, ginger and salt.
Add more sugar or cinnamon if desired. Toss to coat evenly.

Bake in the oven for 60 minutes. Stir
the sweet potatoes once or twice during roasting.