Add mayo, parmesan, anchovy, garlic, mustard, Worcestershire sauce, lemon juice, salt and pepper to a food processor and blitz until smooth and fully blended. Taste test and adjust if needed.
Horizontally slice your chicken breast right through the centre to create 2 even-sized breasts. In a small pot combine 1/2 tsp salt & garlic powder with 1/4 tsp black pepper.
Line up 3 bowls: 1st with flour and half of the seasoning, the 2nd with a beaten egg and the 3rd with 1/4 cup parmesan, the rest of the seasoning and Panko breadcrumbs. Coat the chicken in the flour, then egg and finish with a coating of the parmesan Panko. Ensure the chicken is thoroughly coated at each stage, namely the last stage.
Add a pan to medium heat and pour in enough oil to comfortably fill the base of the pan. Heat the oil until a breadcrumb rapidly sizzles in it, then add in the chicken. Fry both sides for a few mins until golden and crispy on the outside, with the inside white and piping hot. Remove and place on a wire rack with paper towels or a tray underneath to catch excess oil.
Remove most of the oil from the pan, leaving a couple of tbsp behind. Add the bread and toast both sides until crisp and deep golden. Alternatively you can toast the bread under the grill or in a toaster.
Stack the sandwiches with toast, then Caesar dressing, then lettuce, followed by bacon, topped with chicken and a pinch of salt (or some parmesan if you've got some lurking about), finished with toast spread with more Caesar dressing.