This is not my picture but it's similar. My Mom made this when I was growing up. We always had a huge garden with way too much zucchini. I don't know why my Pop always planted so much since us kids didn't really like it. This was one way that I would eat and enjoy it. I havn't changed much since them. This is still one of the only ways I like it...except fried or in cakes or breads, of course. lol
Preheat oven to 350 degrees. Spray 2 quart cassarole with cooking spray. Set aside. Melt butter in saute pan, add olive oil and heat. Add zucchini and onion and saute until almost tender, about 5-7 minutes. Remove from heat and allow to cool enough so veggies won't scramble eggs.
Beat eggs with milk. bread crumbs, sauces and seasonings, and 3 Tablespoons of parmesan cheese. Combine egg & veggie mixture. Turn into 2 quart cassarole that has been sprayed with cooking spray. Top with remaining parmesan.
Bake for 35 - 40 minutes until golden brown. Serve as a side or a main dish with a salad and rolls. Enjoy!