Creamy Vegetable and Sausage Chowder

Name: Creamy Vegetable and Sausage Chowder
Ingredients: 2 tbsp vegetable oil; 12 ounces andouille sausage (diced (or a similar smoked sausage)); 1/2 cup chopped onion; 1/2 cup diced celery; 1/2 cup diced carrot; 2 tbsp butter; 2 tbsp all-purpose flour; 2 1/2 cups vegetable broth; 2 medium potatoes (red or Yukon gold, peeled and diced); 3 cups corn (fresh, frozen, or canned (drained)); 2 cups heavy cream (or half-and-half); 1 cup spinach (chopped ); Kosher salt and freshly ground black pepper (to taste); 1 tbsp chopped fresh parsley; Chopped chives or more parsley (for garnish)