In a medium bowl sift the flour, baking powder, baking soda, salt and cocoa, set aside.
Start by creaming the egg, sugar and vanilla together in a mixer. Add the sour cream, ½ cup at a time - combine well.
When the wet ingredients are well combined add half the dry ingredients. Continue adding by spoonfuls until all of the dry ingredients are combined. Stopping a couple of times to scrape down the sides of the bowl to incorporate all of the ingredients.
Lightly grease the baking sheet or using a silicone mat. Drop the cookies by scoopers onto the baking sheet. Bake in the preheated oven 12-14 minutes until the cookies are baked thru.
Remove from the oven and allow to cool.
For the icing, combine the coffee, melted butter and cocoa and whisk together well. Add the powdered sugar by spoonfuls until it's a drizzling consistency.
Once cookies are completely cool, slather the bottom of one cookies with marshmallow fluff. Top it with a second cookie and drizzle the icing over generously.
Inserting three toothpicks up thru the bottom of the cookie, thru the fluff and into the top cookie will keep the cookies together until they set up. Remove the toothpicks prior to serving!
Serve with and enjoy the eclipse!
Notes
This will make six moonpies using a large ice cream scoop. If you're making smaller cookies about 30 - reduce baking time to 8-10 minutes.