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Preheat oven to 350 degrees
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Coat 9-inch baking dish with olive oil
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Place sliced potatoes on bottom of the dish, completely covering bottom
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Drizzle with olive oil and season with salt & pepper
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In a bowl, combine yellow bell pepper slices, onion slices, minced garlic and thyme, season with salt & pepper
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Place two-thirds of pepper/onion mixture over potatoes, drizzle with olive oil
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Place sliced tomatoes over top of pepper/onion mixture
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Then put sliced zucchini over tomatoes, drizzle with olive oil and season with salt & pepper
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Cover with remaining pepper/onion mixture
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Sprinkle grated cheese on top
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Cover with foil, bake for 40 minutes at 350 degrees
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Uncover casserole and bake for additional 20 minutes at 425 degrees
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Let stand for 10 minutes
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Serve warm