Coconut flour and all-purpose flour cannot be swapped at a 1:1 ratio. Generally you would use approximately 1/4 cup of coconut flour for each cup of all-purpose flour in a recipe, but they bake very differently so be sure to always do research before swapping between any two flours. Instead of swapping flours in this recipe, if you're not looking for a gluten-free or Kosher for Passover recipe, I would suggest checking out this Chocolate Chip Cookie Cake recipe instead!