Pasta Fazool

Ingredients

• 1 tablespoon olive oil
• 12 ounces sweet Italian sausage
• ½ yellow onion, chopped
• 1 stalk celery, diced
• ¾ cup dried pasta
• ¼ cup tomato paste
• 3 cups chicken broth, or more as needed
• ¼ teaspoon crushed red pepper flakes
• ¼ teaspoon dried oregano
• Salt and pepper to taste
• 3 cups chopped Swiss chard
• 1 (15 ounce) can cannellini beans, drained
• ¼ cup grated Parmigiano-Reggiano cheese for serving