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Zucchini Frittata

Zucchini Frittata 3 tablespoons butter 2 tablespoons vegetable oil 2 medium zucchini, thinly sliced 1 medium onion, cut in half and sliced 1/2 cup grated Parmesan cheese, divided 8 large eggs 1/4 cup milk 1 teaspoon salt 1/2…