2 tablespoons olive oil or butter1 smallâ white or yellow onion peeled and diced2 celery stalks, diced2 large carrots, diced3 cloves garlic, peeled and minced1/4 cup all-purpose flour2 cups chicken stock3 cups aldi organic milk, warmed1.5 pounds baby yukon gold (or regular-sized yukon gold)â potatoes,â diced2 cups diced