Mix the wet ingredients (melted butter, egg, and vanilla paste.
Whisk in the brown sugar.
Add the dry ingredients (flour and baking soda).
Fold in the chocolate chips. Save a few to sprinkle onto the top.
Spoon the cookie dough into a small oven-safe skillet.
Top with the remaining chocolate chips.
Place the cookie skillet in the fridge for at least 1 hour.
Preheat the oven to 180°C (356°F).
Bake for 12-14 minutes until the edges are just golden.
Sprinkle with flaky sea salt.
Top with ice cream and dig in.