Preheat the oven to 350°F
Add the flour, baking powder, baking soda, salt, cayenne, cinnamon to a mixing bowl and whisk to combine. Set aside.
Using a stand mixer or hand mixer, cream together the butter with the sugar and brown sugar.
Add the egg, blend to mixed in, then add the egg yolks and mix in. Next, add the vanilla extract and beat until combined.
Add the flour mixture in, a little at a time, and mix until the dough comes together.
Add the 1 cup of dark chocolate and the 1 cup of milk chocolate and use a spatula to mix in the chips to the dough.
Scrape the dough into the skillet, and use the spatula to spread it out evenly across the skillet. Then sprinkle it with the sea salt.
Bake the cookie for 15 minutes, then sprinkle the 2 tablespoons of dark chocolate chips across the top. Turn the skillet 180° in the oven, the cook 15 -20 to minutes more until the centre is just barely cooked.
Remove it from the oven and allow it to cool for 10-15 minutes before serving.
Serve topped with ice cream and chocolate sauce (optional, but highly recommended).