Creating the Crispy Chicken Caesar Sandwich is easy if you follow these steps:

1. Marinate the Chicken: In a bowl, combine the chicken breasts with buttermilk. Allow to marinate for at least 30 minutes or up to overnight in the refrigerator for a more tender result.
2. Prepare Breading Station: Set up three separate bowls—one with flour, one with breadcrumbs, and a third with a mixture of garlic powder, onion powder, paprika, salt, and pepper.
3. Bread the Chicken: Remove chicken from buttermilk, letting excess drip off. First, coat each piece in flour, then dip into the breadcrumbs, pressing gently to ensure coating sticks well.
4. Heat Oil: In a skillet, heat olive oil over medium heat. Add enough oil to cover the bottom of the pan (about 1/4 inch deep).
5. Fry Chicken: Once the oil is hot, add the breaded chicken breasts. Fry for about 4-5 minutes on each side, or until golden brown and cooked through. Ensure an internal temperature of 165°F (75°C).
6. Toast the Bread: While the chicken is frying, toast the bread slices in a toaster or griddle until golden.
7. Assemble Sandwich: Lay the toasted bread on a flat surface. Spread a generous amount of Caesar dressing on each piece.
8. Layer Ingredients: On one slice of bread, add chopped romaine lettuce, a fried chicken breast, and sprinkle with Parmesan cheese.
9. Complete the Sandwich: Top with the second slice of dressed bread and gently press down.
10. Cut and Serve: Slice the sandwich in half, if desired, and serve immediately.

Following these steps will lead you to a delicious Crispy Chicken Caesar Sandwich that you can proudly present to your family and friends!