Tortiglioni with Turkey and Mushrooms

Ingredients

• 225 g (1/2 lb) tortiglioni
• 1 medium onion, chopped
• 500 ml (2 cups / 220 g) mushrooms, sliced
• 30 ml (2 tbsp) olive oil
• 1 packet commercial béchamel sauce mix
• 250 ml (1 cup) milk
• 450 g (1 lb) cooked turkey, diced
• 375 ml (1 1/2 cups / 195 g) Swiss cheese, grated
• 75 ml (1/3 cup) flat parsley, chopped
• Salt and freshly ground pepper, to taste
• 50 ml (1/4 cup) Italian-style bread crumbs