INGREDIENTS
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Kosher salt and freshly ground black pepper
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12 lasagna noodles
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2 tablespoons unsalted butter
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2 tablespoons all-purpose flour
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1 1/2 cups whole milk
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1 large egg
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2 cups whole milk ricotta
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One 10-ounce package frozen chopped spinach, thawed and squeezed dry
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2 1/2 cups shredded mozzarella
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3/4 cup grated Parmesan
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1 cup store-bought pesto
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1 tablespoon extra-virgin olive oil
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Crushed red pepper flakes, optional
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