INGREDIENTS
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1 (10-oz.) package frozen chopped spinach, thawed
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1 (16-oz.) package mezze penne pasta
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2 1/2 tablespoons butter
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3 large shallots, sliced
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2 tablespoons all-purpose flour
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1 1/2 cups half-and-half
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1/2 cup ricotta cheese
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1 cup (4 oz.) freshly shredded Asiago cheese, divided
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10 large eggs, lightly beaten
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1/3 cup loosely packed fresh flat-leaf parsley leaves, coarsely chopped
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1 tablespoon finely chopped chives
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2 teaspoons kosher salt
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1 teaspoon freshly ground pepper
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Garnishes: fresh flat-leaf parsley leaves, shaved Parmesan cheese