Baked Polenta with Sausage and Cheese

Name: Baked Polenta with Sausage and Cheese
Prep time: 30 min
Cook time: 1 h 20 min
Total time: 1 h 50 min
Cuisine: Italian
Ingredients: 2 cups traditional or quick-cooking polenta (or substitute a tube of store-bought cooked polenta); Butter for the baking dish (plus more as needed); 1 pound fresh Italian sausages (sliced 1/2 inch (12 mm) thick); 1 tablespoon extra-virgin olive oil; 1 medium red onion (chopped); 2/3 cup canned low-sodium beef stock; 3 tablespoons mix of finely chopped fresh rosemary and sage; Sea salt; Freshly ground black pepper; 12 ounces Taleggio cheese (chopped or grated (or substitute fontina)); 1 1/2 cups Parmesan cheese (grated)