Preheat oven to 350°F. Grease or line a 6-7inch round cake pan or skillet with parchment paper.
In a large bowl, whisk together the almond flour, tapioca starch, and baking powder.
In another bowl, whisk the melted coconut oil, coconut sugar, maple syrup, egg + yolk, vanilla, and salt.
Add the wet ingredients to the dry, and stir until a dough forms. Fold in chocolate chunks or chips.
Spread batter into your prepared pan and smooth the top. Sprinkle with extra chocolate and a pinch of sea salt if desired.
Bake for 15 minutes, or until golden and a toothpick inserted comes out clean. Let cool completely.