Cheesy Sausage Potato Soup

Olive oil (1/2 tsp)

Onion (diced, 1/2 cup)

Italian ground sausage (1 lb)

Russet potatoes (peeled and diced, 4 cups)

Celery (diced, 1 cup)

Chicken broth (4 cups)

Heavy cream (1 cup (can be substituted for half and half))

Shredded cheddar cheese (1 cup)

Optional: Additional cheese and fresh parsley for topping.