Preheat oven to 350F and grease a 6-inch cast iron skillet (or an 8x8 pan). Melt chocolate chips and coconut oil in the microwave, then let it cool. In a large bowl, combine almond flour, cocoa powder, baking powder, and salt.

Whisk two eggs and coconut sugar into the melted chocolate, then mix with the dry ingredients. Pour the batter into the skillet, top with additional chocolate chips if desired, and bake for 30-35 minutes or until a toothpick comes out clean.