Zucchini-Pepperoni Pizza Frittata

2 tablespoons all-purpose flour

6 1/4-inch-thick tomato slices

4 ounces thinly sliced mozzarella cheese

2 teaspoons snipped fresh oregano

4 egg s, slightly beaten

6 1/8-inch-thick pepperoni slices

3 cups thinly sliced zucchini

2 teaspoons snipped fresh basil

1/4 teaspoon freshly ground pepper

1/4 teaspoon salt

2 teaspoons snipped fresh thyme

2 tablespoons olive oil