Preheat oven to 350 degrees, racks in the top third.
In a large bowl combine the bananas, vanilla extract, and coconut oil. Set aside. In another bowl whisk together the oats, sunflower seeds, cacao powder, shredded coconut, salt, and baking powder. Add the dry ingredients to the wet ingredients and stir until combined. Fold in the chocolate chunks/chips.The dough is a bit looser than a standard cookie dough, don't worry about it. Drop dollops of the dough, each about 1 - 2 tablespoons in size, an inch apart, onto a parchment (or Silpat) lined baking sheet. Bake for 13 - 15 minutes. Until golden on the bottoms.
