INGREDIENTS
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8ouncesmanicotti noodles
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4tablespoons(1/2 stick) unsalted butter
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1medium onion, chopped
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2cloves garlic, chopped
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kosher salt and black pepper
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128-ounce can whole peeled tomatoes
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1/4cupall-purpose flour
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2cupswhole milk
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115-ounce container ricotta (about 1 3/4 cups)
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110-ounce package frozen chopped spinach, thawed and squeezed of excess liquid
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1cupgrated Parmesan (4 ounces)
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1large egg
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1teaspoondried oregano