INGREDIENTS
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3 tablespoons butter
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2 tablespoons vegetable oil
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2 medium zucchini, thinly sliced
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1 medium onion, cut in half and sliced
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1/2 cup grated Parmesan cheese, divided
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8 large eggs
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1/4 cup milk
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1 teaspoon salt
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1/2 teaspoon pepper
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1/4 cup chopped fresh basil
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Garnish: chopped seeded plum tomatoes