INGREDIENTS
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Nonstick cooking spray
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1 pound packaged dried medium shell pasta
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5 tablespoons butter
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1 medium sweet onion (such as Vidalia or Maui), halved and thinly sliced
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1/3 cup all-purpose flour
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3/4 teaspoon salt
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1/2 teaspoon ground black pepper
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3 cups milk
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1 pound Brie cheese, trimmed, cut into small wedges, and chopped (reserve 8 small wedges for topping)
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12 ounces fresh cooked crabmeat or canned lump crabmeat, drained, flaked, and cartilage removed
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3 slices firm white bread, torn into large pieces