Thin Mint Pizookie

0 Preheat oven to 350 and grease an 8" cast iron skillet
1 In a large mixing bowl add the flaxseed with tbsp of water and let gel for 3-5 minutes 
2 Add the butter and sugar into the bowl and mix until combined
3 Stir in flour, cocoa powder, peppermint extract, salt, baking powder, and baking soda until everything is evenly incorporated and a dough forms
4 In the bottom of the cast iron skillet make an even layer of chocolate cookies. (It is okay if there are some holes)
5 Then sprinkle the chocolate cookie dough over the cookies and press down to form an even layer of cookie dough over the cookies. 
6 Place in the oven to bake for about 25 minutes until dough has set
7 Sprinkle chocolate chips over the top of the cookie and allow to melt for a couple minutes. Then spread the chocolate into a even layer.
9 Option to serve warm so that the cookie is super fudge, or let cool so the cookie sets and gets a little more crumbly, and the chocolate topping forms more of a shell.