Clean apples and core, slit around center. Add into hole of each apple:

1 to 2 tbsp. brown sugar
1 tsp. butter
1 marshmallow
1/8 tsp. cinnamon

Pour 1/4 cup water in bottom of glass baking dish. Place apples in baking dish. Bake at 375 degrees for 45 minutes. Baste syrup occasionally while cooking.