Place lettuce in a large bowl. Drizzle with desired amount of Caesar dressing; toss gently to coat. Sprinkle with the 1/4 cup grated Parmesan cheese; toss gently to combine. Top with Parmesan Croutons; sprinkle with pepper. If desired, sprinkle with additional Parmesan cheese and serve with lemon halves to squeeze over salad.
Preheat oven to 300 degrees F. Cut bread into 1-inch cubes (you should have about 3-1/2 cups); set aside. In a small saucepan melt butter. Remove from heat. Transfer to a large bowl. Stir in Parmesan cheese and garlic. Add bread cubes, stirring until cubes are coated with butter mixture. Spread bread cubes in a single layer in a shallow baking pan or on a baking sheet. Bake for 10 minutes; stir. Bake about 10 minutes more or until bread cubes are crisp and golden. Cool completely; store in an airtight container for up to 24 hours.