How to adjust recipe without chocolate

Instead of trying to alter this recipe, why not simply look for a recipe to make a olive oil pumpkin bread? You can substitute the kabocha squash for the pumpkin- or for any other type of squash, really- and it works just fine. The size of the final bread will not be changed much by leaving out the chocolate, because the majority of the mass is from the batter containing the squash and other ingredients. You can also opt to fill the loaf pan you have 2/3 full, and then bake the balance of batter in a muffin pan. The muffin size will bake faster, just so you know. And you can freeze them for later munching, if you like.