Preheat oven to 350 degrees.

I the bowl of an electric stand mixer cream together butter, sugar, and brown sugar until light and fluffy. Add egg, yolk, vanilla and food coloring; mix until well combined. Mix in flour, cocoa powder, baking soda and salt until just combined. Fold in chocolate chips. Add more food coloring if desired.

Place batter in an 11 inch skillet (oven safe). Leave about a 1 inch gap around the edge, so the cookie can spread and bake evenly.

Bake for 15-17 minutes until the edges are starting to get crispy and the center is set.

Remove from the oven and let cool for 5 minutes. Top with ice cream and hot fudge to serve.

Best served warm, but can cut into slices cooled as well.