Someone brought 3 large zucchinis to us at our school. I want to make the zucchini into a casserole dish that our office staff can share. Would you please share your ideas for how to turn these gifts into an edible casserole dish? I'm thinking of slicing the zucchini into thin slices, cooking them lightly and adding onion, mushrooms. What else? Cheese? Eggs? What would you do?