Preheat oven to 350 ° .
Cream brown sugar, butter, shortening together.Add eggs & mix well.
Add salt,cinnamon, baking powder and mix well. Mix baking soda & boiling water together. Then add to your mixing bowl and mix. Add flour & oatmeal . Mix well.
Scoop dough onto parchment lined cookie sheet. By rounded teaspoonfuls. ( I used a #40 scoop) .Bake 10 minutes. Mine took a little longer. Be careful not to burn them. Remove from oven & cool completely.
Scoop a small amount of marshmallow fluff onto one cookie, top with another cookie. Lightly press them together.Freeze right away if not eating them right away.
