One by one, place a chicken breast on the chopping board and horizontally slice it right through the centre to make 2 even sized breasts.
In a large mixing bowl whisk 1 1/4cups/300ml buttermilk and 1 egg with 1 tsp paprika & salt and 1/2 tsp onion powder, garlic powder, cayenne pepper & white pepper. Add in the chicken cutlets and use tongs to fully coat them. Cover with cling film and marinate in the fridge for as long as you have time for. Overnight is perfect, a few hours is great, but even just 10-20mins at room temp as you prep the other ingredients will work. If marinating in the fridge, take the chicken out 30mins before needed to bring close to room temp.
In a large shallow bowl or baking tray with curved edges combine 1 3/4cups/250g flour with 2 tsp paprika, 1 tsp oregano, baking powder & salt, 1/2 tsp onion powder, garlic powder, black pepper & 1/4 tsp cayenne pepper. One by one take a chicken cutlet straight out the marinade and dredge in the flour. Really make sure you work the flour into the meat to create lots of small craggy bits. Give it a shake, then place to one side and repeat.
In a cast iron skillet or heavy deep pan heat up 1 cup/250ml veg oil over medium heat. The oil should comfortably cover the base of the pan, and come up to just over halfway up the chicken. When the oil is around 180C/350F, or shimmery, but not smoking, carefully place in 2-3 cutlets. You can check with a crumb that the oil rapidly sizzles before you do this if you want.
Leave to fry for 3-4mins, or until the bottom side has turned crispy and deep golden. Don't move the chicken for the first 2 minutes. Carefully flip and fry for another 3-4mins, then place on a wire rack with paper towels underneath. Repeat with remaining chicken, adding more oil and bringing back up to heat as needed.
Serve up and enjoy! See notes for serving suggestions.