INGREDIENTS
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8 ounces penne pasta
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2 tablespoons butter
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1/2 yellow onion, chopped
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1 teaspoon garlic, minced
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8 ounces fresh spinach, washed, drained, and chopped
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2 tablespoons all purpose flour
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3/4 cup milk
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1/2 cup shredded mozzarella cheese
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1/2 cup ricotta cheese
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1 teaspoon sugar
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coarse salt and freshly ground pepper, to taste
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1/2 teaspoon crushed red pepper flakes
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1/2 cup shredded Parmesan cheese