Step 1

Preheat the oven to 350 degrees F.

Step 2

In a bowl, whisk together the flour, baking powder, soda, and salt.

Step 3

Heat an oven safe (preferably cast iron!) 12-inch skillet over low heat. Let the skillet heat up for 5 minutes. Add the butter and let it melt completely. Stir in the sugars with a wooden spoon. Turn off the heat under the skillet. You MUST turn off the heat! You can also remove the skillet from the burner if you wish.

Step 4

Whisk together the egg and egg yolks in a bowl. Add it to the skillet sugar mixture and mix in right away with a spoon, quickly mixing so the eggs don’t cook from the heat. Stir in the vanilla extract.

Step 5

Stir in the dry ingredients until just combined. This will take a minute or two and the mixture will be thick, but they will mix in! You can wipe the top of the skillet or the sides with a damp paper towel to remove excess flour.

Step 6

Stir in the chocolate chips. Bake the skillet cook for 20 to 25 minutes, or until it’s mostly set in the center. Top with flaked sea salt.

Step 7

Serve warm with vanilla ice cream.