Preheat the oven to 400 degrees Fahrenheit. Line a baking sheet with parchment paper.
Prepare the croutons: Cut the bread into ½-inch cubes and place on the baking sheet. Drizzle with olive oil, sprinkle with salt, garlic powder, and black pepper. Toss to coat. Bake for 10-12 minutes until golden.
Make the dressing: In a bowl, combine mayonnaise, minced garlic, lemon juice, Dijon mustard, and Worcestershire sauce. Stir in grated Parmesan cheese. Adjust seasoning with black pepper.
Assemble the salad: In a large bowl, place chopped romaine lettuce. Add croutons and drizzle with the dressing. Toss to combine.
Serve immediately, garnished with extra Parmesan cheese if desired.