Every summer no matter how few plants we plant it seems like we have too much zucchini and yellow squash. Since the neighbors don't like it when we leave it on their door steps, I've had to come up with ways to get my family to eat it. This is my husbands & mine favorite way.
Heat olive oil in 10" sauté pan. Add garlic and cook for a couple seconds, add onions, zucchini and yellow squash. Cook until onions are soft and squash is browned. Take off the heat and toss in Parmesan cheese. Sprinkle with salt and pepper to taste.