Follow these straightforward steps to create your delicious Crispy Chicken Caesar Sandwich:

1. Marinate the Chicken: In a bowl, soak the chicken breasts in buttermilk for at least 30 minutes. This will tenderize the meat.
2. Prepare Breading Station: In three shallow dishes, place flour in the first dish, beaten eggs (optional) in the second, and breadcrumbs mixed with garlic powder, onion powder, paprika, salt, and pepper in the third.
3. Bread the Chicken: Remove chicken from buttermilk, allowing excess to drip off. Dredge each breast in flour, dip in egg (if using), then coat in the breadcrumb mixture.
4. Cook Chicken: Heat oil in a large skillet over medium heat. Add the breaded chicken and cook for about 5-7 minutes per side, or until golden brown and fully cooked.
5. Toast Bread: While the chicken cooks, lightly toast the bread slices in another skillet or toaster until golden brown.
6. Assemble the Sandwich: Once the chicken is cooked, place it on one slice of toasted bread. Add a generous portion of chopped romaine lettuce, drizzle with Caesar dressing, and sprinkle with Parmesan cheese.
7. Finish Assembly: Top with another slice of toasted bread. Press down gently to hold everything together.
8. Serve Immediately: Cut the sandwich in half if desired, and serve with lemon wedges on the side for an extra zesty touch.