Cut chicken breast into 4 cutlets. Slice horizontally and vertically through the middle.
Mix 2 TBSP Romesco and 2 TBSP mayonnaise, and place in a pasta style bowl, large enough to dredge the cutlets.
Place Panko, salt and pepper in a pasta style bowl.
Pat chicken cutlets dry, then dredge both sides in the mayonnaise mixture and then the panko.
Place dredged cutlets on a plate and heat the oil, on high in a non-stick pan.
Spread oil evenly and when pan is hot add the cutlets. Sear on each side for 3 – 4 minutes, until golden and cooked through.
Place 2 cutlets on a bun and serve with garnishes of choice: lettuce, tomatoes and/or cucumber. Spread remaining 1 TBSP of Romesco on top of the bun and serve immediately.