Preheat the oven to 350 F. In a large bowl, whisk together flour, granulated sugar, cocoa powder, salt, and baking soda. Add in melted butter, eggs, and vanilla extract and mix until smooth.
In a medium bowl, whisk together flour, salt, and baking soda. In a large bowl, combine butter with sugar until fluffy. Add in egg and mint extract, and mix until smooth.
Add in the flour mixture, mix until it is fully combined. Add in the green food coloring, and mix until it is fully green. Fold in the chocolate chips.
Evenly pour the brownie batter into a greased 8-inch square baking dish. Top with the mint chocolate chip cookie dough. Bake for 25-30 minutes.
