Pre-heat oven to 350 degrees (F).
Remove dough from fridge and place on a clean and floured surface. Roll the dough out until it is about 1/8 inch thick. Using a circle cookie cutter or a large round cup, cut 12 circles out of the pie dough. (6 circles from each disc of dough)
Place the circles on a baking sheet lined with parchment paper or a silicone mat. If the dough is too warm and flimsy refrigerate for about 10 minutes before baking. This will help the dough not to spread while baking.
Using a spoon, scoop about a tablespoon of chocolate ganache into the center of 6 of the dough circles.
Place the other 6 dough circles on top and press a fork around the edges to seal the hand pies.
Place the hand pies in the oven and bake for 25-30 minutes or until the pies and golden brown.
During the last few minutes of baking remove the pies from the oven and top with mini marshmallows. Place back in the oven to finish baking.
Remove the hand pies from the oven and immediately place a chocolate square on the top.