Prepare the Fried Chicken
Season the chicken breasts with salt and black pepper. In a shallow dish, combine the flour, paprika, garlic powder, onion powder, salt, and black pepper. Dip each chicken breast into the buttermilk, then coat it in the flour mixture, pressing down to make sure it's well coated.
Fry the Chicken
Heat oil in a deep fryer or large skillet over medium-high heat. Once the oil is hot (about 350°F or 175°C), carefully place the chicken breasts in the oil. Fry the chicken for 4-6 minutes per side, or until golden brown and the internal temperature reaches 165°F (75°C). Remove from the oil and let the chicken rest on a paper towel-lined plate.
Make the Homemade Caesar Dressing
In a small bowl, whisk together the mayonnaise, Dijon mustard, lemon juice, minced garlic, grated Parmesan cheese, Worcestershire sauce, salt, and black pepper. Adjust seasoning to taste.
Toast the Bread
Toast the bread slices in a toaster or on a grill pan until golden brown and crispy.
Assemble the Sandwich
Spread a generous amount of homemade Caesar dressing on both slices of toasted bread. On the bottom slice, layer the chopped romaine lettuce, fried chicken, and grated Parmesan cheese. Top with the second slice of bread to close the sandwich.
Serve
Cut the sandwich in half and serve immediately. Enjoy the crispy, indulgent Fried Chicken Caesar Salad Sandwich with homemade Caesar dressing!