Wrap the chicken breasts in cling wrap and use a mallet to beat each of the chicken breasts to a fillet with a thickness of 1cm.
Line up a flat plate, two bowls large enough to hold a chicken breast fillet, and a fourth plate for the coated chicken breast fillets: transfer the flour to the first plate; whisk the egg and milk in the second bowl; and combine the breadcrumbs, parmesan, celery leaves and lime zest in the third dish.
Press a chicken breast fillet into the flour, one side then the first, ensuring it’s completely covered in flour.
Dip the flour-dusted chicken breast fillet into the milky-egg wash.
Press the chicken breast fillet into the Panko breadcrumb mix, one side then the other, ensuring its completely covered in crumbs.
Move the chicken breast fillet to the empty plate, then repeat with the other fillets.
Refrigerate the chicken breast fillets for 30 minutes.
In a fry pan or skillet large enough to hold two chicken breast fillets, heat 1cm of olive oil over medium heat, then shallow-fry the fillets for around 5 minutes a side until golden-brown. Transfer to a rack to drain off any excess oil and repeat.
Serve with chicken schnitzels immediately with lemon wedges, your favourite mustard, and our warm potato salad.