For the Soup:

• 1 tablespoon olive oil
• 1 pound kielbasa, cut into ½ inch pieces
• 2 garlic cloves, minced
• ½ cup yellow onion, finely diced
• ½ cup carrots, peeled and finely diced (about 2 large carrots)
• ½ cup celery, finely sliced (2–3 stalks)
• 4 cups chicken stock
• 1 1/2 pounds potatoes, cut into cubes
• 2 cups heavy cream or whole milk
• 2 cups shredded cheddar cheese
• ½ cup shredded parmesan cheese
• ½ tsp kosher salt
• ¼ tsp black pepper
• ¼ cup chopped parsley