- Step 1 Preheat oven to 325 degrees F (165 degrees C).
- Step 2 In a large pot boil the zucchini until tender; drain. Meanwhile, in a medium frying pan heat the olive oil over medium heat and saute the onion and garlic until the onion is tender.
- Step 3 Combine the zucchini, onion and garlic in a 9x12 inch casserole dish, and mix well. Pour the spaghetti sauce over the mixture and stir well. Top with mozzarella cheese (use more or less depending on your preference).
- Step 4 Bake in preheated oven for about 20 minutes, or until heated through and cheese is bubbly.