In a bowl, combine mayo, olive oil, Dijon mustard, lemon juice, minced garlic, Worcestershire sauce, parmesan cheese, salt, and pepper. Store in the fridge until ready to use. (You can make the dressing 2-3 days ahead of time.)
Shred the romaine and add it to a large salad bowl. (Rinse and spin in a salad spinner.)
Add the crispy bacon bits, cooked chicken, croutons and shredded parmesan cheese to the salad bowl. Season with salt and pepper.
Pour the salad dressing over the salad and toss until well combined. Taste and adjust the seasoning and add more dressing if desired.