Combine the flour, brown sugar, baking soda, salt, and chocolate in a medium bowl. Stir to combine.
In a large bowl, beat the rest of the ingredients until well combined. Stir in the flour mixture until well combined.
Brush your cast iron skillet or pan lightly with coconut oil and spread the batter in evenly.
Bake for 30-40 minutes until the top is light brown and a toothpick inserted in the center comes out clean. Depending on the pan you use this may take longer, but don’t over bake.
Allow the cake to cool before slicing into wedges and serving.