Truffled mac 'n' cheese

Name: Truffled mac 'n' cheese
Prep time: 30 min
Cook time: 40 min
Total time: 1 h 10 min
Cuisine: American
Ingredients: 500g macaroni; 1l whole milk; 2 bay leaves; 60g butter; 60g plain flour; 2 tbsp Dijon mustard; 2 tbsp roughly chopped thyme leaves; 80g porcini white truffle paste or 2 tbsp truffle oil; 1 tbsp porcini powder (or dried porcini mushrooms blitzed to a powder in a food processor); 80g taleggio cheese , chopped; 125g ball of mozzarella , chopped; 100g mature cheddar , grated; 30g fresh breadcrumbs; 30g parmesan , finely grated