Crouton Prep: Preheat your oven to 180∘C (350∘F). In a large bowl, toss the bread cubes with olive oil, garlic powder, salt, and pepper until evenly coated. Spread them in a single layer on a baking sheet.
Bake the Croutons: Bake for 10-15 minutes, tossing halfway through, until golden brown and crispy. Keep a close eye on them to prevent burning. Let them cool completely.
Whip Up the Dressing: While the croutons cool, make the dressing. In a medium bowl, whisk together the mayonnaise, fresh lemon juice, Dijon mustard, Worcestershire sauce, minced garlic, and anchovy paste. Whisk vigorously until everything is smooth and well combined.
Add Parmesan & Adjust: Stir in the ¼ cup of grated Parmesan cheese. If the dressing is too thick for your liking, whisk in cold water, one tablespoon at a time, until it reaches your desired consistency. Season with freshly ground black pepper to taste. (You likely won’t need extra salt due to the anchovy paste and Parmesan.)
Assemble the Salad: In a very large bowl, place the chopped romaine lettuce. Drizzle about half of the dressing over the lettuce.
Toss & Serve: Toss the lettuce gently to coat it evenly with the dressing. Add most of the cooled croutons and a generous sprinkle of extra Parmesan cheese. Toss once more. Serve immediately, with extra croutons and Parmesan on the side for those who want more!