1/2 c. onion, diced
3 c. zucchini, diced (one med. to lg. zucchini)
1/2 c. oil
1 c. Bisquick baking mix
1/2 c. grated Parmesan cheese
1/3 tsp. salt
1/8 tsp. pepper
4 eggs, beaten

Mix all well and pour into greased square oven-proof dish. Bake at 350 degrees for about 40 minutes. Good hot for dinner or a cold piece is good with a sandwich at lunch.