Cookies:

1 cup butter, softened
3/4 cup brown sugar
1/2 cup sugar
1 tablespoon molasses
1 teaspoon vanilla extract
2 eggs
1 3/4 cups all purpose flour
1/2 teaspoon salt
1 teaspoon baking soda
1/4 teaspoon cinnamon
1 1/2 cups quick oats

Cream Filling

2 teaspoons hot water
1/8 teaspoon salt
1 (7 ounce) jar marshmallow cream
1/2 cup vegetable shortening
1/3 cup powdered sugar
1 teaspoon vanilla extract