Preheat the oven to 300°F. Cut the pizza into tiny pieces and spread them across a parchment-lined baking sheet. Place in the oven and bake for about 6-8 minutes until warmed through, with melting cheese.
While the pizza is warming, combine the lettuce and tomatoes in a large mixing bowl. Drizzle Italian salad dressing over the vegetables and toss well to coat. Sprinkle with basil, if desired, and toss to mix throughout. Top with mozzarella and Parmesan. Toss again.
Scoop the salad into bowls and top with the warm pizza croutons. Serve immediately. Drizzle with additional Italian dressing or Ranch dressing, if desired.