03Reduce oven temperature to 400°F. Sprinkle mozzarella over bottom of crust. Top with 6 tablespoons Parmesan, tomatoes, basil, green onions, and oregano. Arrange zucchini rounds in concentric circles to cover top of tart. Whisk eggs, half and half, salt, and pepper in medium bowl. Pour mixture into tart. Sprinkle with remaining 1/4 cup Parmesan.
04Bake tart until custard is set and crust is golden brown, about 35 minutes. Serve warm or at room temperature.