"A sky-high vegetable lasagna with five layers of noodles, sauce, cheese, and vegetables and a bronzed, crackly top...."
INGREDIENTS
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4 tablespoons olive oil, divided
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1 large yellow onion, diced small
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4 cups small-diced (about 1/2-inch pieces) vegetables (see Note)
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5 ounces baby spinach or another green you like, roughly chopped
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Kosher salt and freshly ground black pepper
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3 garlic cloves, finely chopped
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Red pepper flakes
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1 teaspoon dried oregano
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1 6-ounce can tomato paste
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1 (28-ounce) can crushed tomatoes
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Handful chopped fresh basil (optional)
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1 pound dried lasagna noodles (not no-boil type)
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1 pound (2 cups) whole milk ricotta
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1/4 cup heavy cream (optional)
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1 pound coarsely shredded low-moisture mozzarella
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1 cup (4 ounces) finely grated parmesan