5 sweet potatoes, peeled and cut into 1/2 inch slices
3/4 cup packed brown sugar
1/4 teaspoon ground cinnamon
1/8 teaspoon ground ginger
1/8 teaspoon ground nutmeg
1/2 teaspoon salt
1/4 cup butter, cut into pieces
1/2 cup coarsely chopped cashews
1 cup miniature marshmallows