Double Chocolate Cookie Skillet

1 Preheat oven to 350°F (175°C).
2 In a large bowl, whisk together melted butter, brown sugar, and granulated sugar until smooth and glossy.
3 Add egg yolks and vanilla. Mix until fully combined.
4 Stir in flour, cocoa powder, baking soda, and salt until just combined.
5 Fold in chocolate chips and chocolate chunks.
6 Press dough evenly into a lightly greased 6-inch skillet. Smooth the top.
7 Bake for 28–35 minutes, until: Edges are set, Top looks mostly set, Center is still slightly soft but not liquid
8 Let cool in the skillet for 10–15 minutes before serving. It will continue to set as it rests.