Preheat oven to 375°F (190°C). Toss bread cubes with olive oil, garlic powder, and salt. Bake for 10–12 minutes until golden. Let cool.
Whisk together garlic, mustard, Worcestershire, lemon juice, and anchovy paste. Add mayonnaise and Parmesan, whisk until smooth. Season with salt and pepper.
In a large bowl, toss chopped lettuce with dressing. Add croutons and Parmesan. Serve immediately with black pepper and lemon if desired.
Notes
Use day-old bread for best croutons and adjust seasoning to taste.