1. Heat oven to 200°C. Cut the bread into big croutons and spread over a large baking sheet. Sprinkle over 2 tbsp olive oil. Rub the oil into the bread and season with a little salt. Bake for 8-10 mins, turning the croutons a few times so they brown evenly.
2. Rub chicken breasts with remaining oil, season. Cook the chicken in a hot pan for 4 mins, then turn and cook for 4 mins more. Check if it’s cooked by poking the tip of a sharp knife into the thickest part; there should be no sign of pink and juices will run clear.
3. Peel and crush the garlic. Mash the anchovies with a fork, grate a handful of cheese and mix with the rest of the dressing ingredients. Season to taste.
4. Tear lettuce into large pieces and put in a large bowl. Pull chicken into bite-size strips and scatter half over the leaves, along with half the croutons. Drizzle with the dressing, sprinkle more cheese on top and serve straight away.