I would say that you don't NEED the avocado exactly - it adds fat and makes the bread softer, but if you just have the quarter-cup of olive oil you should be fine. This particular recipe is not overly sweet, either, so to me it pairs well with peanut butter or (vegan) cream cheese. And if the zucchini don't provide two entire cups you could always try making muffins with a smaller amount, just bake them for maybe 20 minutes.
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I would say that you don't NEED the avocado exactly - it adds fat and makes the bread softer, but if you just have the quarter-cup of olive oil you should be fine. This particular recipe is not overly sweet, either, so to me it pairs well with peanut butter or (vegan) cream cheese. And if the zucchini don't provide two entire cups you could always try making muffins with a smaller amount, just bake them for maybe 20 minutes.