INGREDIENTS
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1 tablespoon olive oil1/2 yellow onion, finely chopped
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1 red bell pepper, finely chopped
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1 pinch kosher salt
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1 garlic clove, minced
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1 28-ounce can diced tomatoes
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1 box (16 ounces) short pasta, cooked until al denta
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2 cups grated mozzarella cheese, divided
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1 cup finely grated Parmesan cheese