Creating the Crispy Chicken Caesar Sandwich is a straightforward process. Follow these simple steps for delicious results:

1. Marinate the Chicken: In a bowl, combine the buttermilk, garlic powder, onion powder, salt, and pepper. Add the chicken breasts, ensuring they are completely submerged. Let them marinate in the refrigerator for at least 30 minutes, or up to overnight for deeper flavor.

2. Prepare the Breadcrumb Mixture: In a shallow dish, mix the breadcrumbs, Parmesan cheese, oregano, salt, and pepper until well combined.

3. Coat the Chicken: Remove the chicken from the marinade, allowing excess buttermilk to drip off. Dredge each piece in the breadcrumb mixture, ensuring an even coating.

4. Heat the Oil: In a large skillet, heat about ½ inch of olive oil over medium heat. Ensure the oil is hot but not smoking.

5. Fry the Chicken: Carefully place the breaded chicken breasts in the hot oil. Cook for about 5-7 minutes per side, or until golden brown and cooked through. The internal temperature should reach 165°F (75°C). Transfer to a paper towel-lined plate to drain any excess oil.

6. Toast the Buns: While the chicken rests, lightly toast the sandwich buns in the same skillet or in a toaster.

7. Assemble the Sandwiches: On the bottom half of each bun, spread some Caesar dressing. Top with a generous amount of chopped romaine lettuce, followed by the crispy chicken piece.

8. Add More Flavor: Drizzle additional Caesar dressing over the chicken and sprinkle more Parmesan cheese on top.

9. Finish: Place the top half of the bun on each sandwich, pressing down gently.

10. Serve Immediately: Enjoy your Crispy Chicken Caesar Sandwich while the chicken is still hot for optimal crispiness.