Spaghetti with Zucchini Sauce

1 medium onion, sliced
1/4 cup olive oil
2 medium zucchini, sliced
3 cups diced tomatoes
1/2 teaspoon salt
1 bay leaf
1/4 teaspoon pepper
1/4 teaspoon basil leaves
1/4 teaspoon oregano leaves
8 ounces spaghetti
Grated Parmesan cheese

In large skillet or pot, sauté onion in hot oil until crisp-tender.

Add zucchini, tomatoes, salt, bay leaf, pepper, basil and oregano. Simmer covered for 15 minutes; uncover and simmer 10 minutes longer.

Discard bay leaf.

Meanwhile, cook spaghetti as directed on package; drain.