Beer and Cheddar Soup with Kielbasa Sausage

Name: Beer and Cheddar Soup with Kielbasa Sausage
Ingredients: 2 tablespoon plus 2 tsp. vegetable oil, divided; 1 medium yellow onion, chopped; 2 cloves garlic cloves, chopped; 6 tablespoons (¾ stick) unsalted butter; ⅓ cup all-purpose flour; 3 cups low-sodium chicken broth; 12 oz. lager (such as Brooklyn Brewery); ½ cup heavy cream; 8 oz. mild yellow cheddar, grated; Kosher salt and freshly ground black pepper; 1 lb link kielbasa sausage, cut into 6–8 pieces; 1 apple, cored, sliced