Add olive oil to a Dutch oven or soup pot and warmth over medium-high warmth. Add the sausage and cook dinner for 5-6 minutes, stirring ceaselessly. Take away the sausage utilizing a slotted spoon.
Add garlic, onions, carrots, and celery and sauté for two minutes.
Add the rooster inventory and potatoes. Carry to boil after which cut back warmth. Cowl and cook dinner for quarter-hour, or till the potatoes are tender.
Add the cooked sausage, milk, cheddar cheese, parmesan cheese, salt, and pepper. Stir and cook dinner on low warmth 5-10 minutes longer, till the cheese has melted.
Stir in parsley earlier than serving.
