INGREDIENTS
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8 ounces uncooked ziti, penne, or other tubular pasta
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2 tablespoons butter
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1/2 cup chopped onion
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1/2 cup chopped red bell pepper
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1 (10-3/4-ounce) can cream of mushroom soup
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1 (15-ounce) container ricotta cheese
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2 (6-ounce) cans solid white tuna, drained and flaked
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2 cups (8 ounces) shredded mozzarella cheese, divided