Preheat oven to 350 degrees
Grease a 10 inch cast iron skillet with butter or oil
Chop up the butter into inch chunks and melt in a small pan
Once melted set the pan on the counter to cool
In a medium sized bowl mix the almond flour, baking soda and salt together and set aside
In a large bowl, whisk the egg until thoroughly mixed and add in the sugar
Mix till incorporated and add the melted butter little by little so as not to cook the egg
Add vanilla and stir to incorporate
Next add the almond flour mix and stir to combine
Lastly add 2/3 of the chocolate chips ( save a few to spread on top of cookie cake ) and stir
Spread the mixture into the pre greased skillet and top it with the remaining chocolate chips
Bake for up to 16 minutes or till golden on top. It will be gooey and will harden as it cools.
Enjoy with a scoop of vanilla ice cream!