Neely's Zucchini Gratin

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2 tablespoons butter

1 medium onion, chopped

3 cloves garlic, chopped

6 zucchini, sliced into half moons 1/4-inch thick

2 plum tomatoes, chopped and seeded

1 tablespoon freshly chopped thyme leaves

2 tablespoons all-purpose flour

Salt and freshly ground black pepper

1 tablespoon brown sugar

2 eggs, beaten

1/2 cup half-and-half

1/4 cup grated sharp white Cheddar

1/4 cup grated Parmesan