• Preheat oven to 350º F

Make the Brownie Batter

• Place a 12 inch cast iron skillet over low heat, melt the 1 cup butter. Remove from the heat and add in 1 cup semi sweet chocolate chips and stir until melted.
• Add in the 2 eggs, 1 cup sugar, and 1/2 teaspoon vanilla. Stir to combine and the sugar is dissolved.
• Add the 1 1/2 cup all purpose flour, 1/3 cup cocoa powder, and 1/2 teaspoon salt to the butter, sugar mixture and mix until combined together, don't overmix.

Make the Cookie Dough

• Cream together the softened 1/2 cup butter, 1/4 cup sugar, 1/2 cup brown sugar, 1 egg, and 1 teaspoon vanilla until combined by hand or with an electric mixer.
• To the same bowl add in the 1 1/2 cups flour, 1/2 teaspoon baking powder, 1/4 teaspoon baking soda, and 1/2 teaspoon salt. Continue to mix by hand or with an electric blender until a soft dough is formed.
• Mix in the 1 cup semi sweet chocolate chips, making sure to scrape the sides and bottom of the bowl to incorporate all of the ingredients.

Prepare For Baking

• Scoop 2 tablespoon sized portions of cookie dough randomly on top of the brownie batter in the skillet. Spread the dough with a knife or spatula over the brownie batter.
• Bake for 20-25 minutes until the cookies are browned on top and the brownie is crisp around the edges.