INGREDIENTS
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1 tablespoon extra-virgin olive oil
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2 cloves garlic, minced
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1 medium yellow onion, chopped
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1 small zucchini, finely diced
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1 small yellow squash, finely diced
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Salt and freshly ground black pepper
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One 15-ounce container whole-milk ricotta
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1/2 cup finely grated Parmesan cheese
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3 tablespoons chopped fresh flat-leaf parsley leaves
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1 large egg, beaten
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One 28-ounces can whole peeled San Marzano tomatoes
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1 teaspoon salt
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1/4 teaspoon freshly ground black pepper
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1/4 cup chopped fresh basil leaves
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Neutral oil or nonstick cooking spray, for the baking dish
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12 manicotti shells, cooked according to package instructions and drained
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1 1/2 cups grated mozzarella cheese
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1/4 cup grated Parmesan cheese