3. Place the chicken breast fillets between two sheets of clingfilm. Hit them with a rolling pin until they are even in size and about 1cm thick.
4. Remove the herbed garlic butter from the freezer and thinly slice. Divide the butter between the flattened chicken fillets, place the slices of the butter on one side of the chicken breast fillet, and fold the non-buttered side on top. Press down with the edges of the chicken and pinch with your fingers. Cover with clingfilm and put in a fridge for 30 minutes.
5. Place a frying pan over a medium/high heat and add enough vegetable oil to fill 2cms. Put the flour on a plate and season with sea salt and freshly ground black pepper. Use another plate for the whisked eggs and lastly mix together the breadcrumbs and cheddar cheese on another plate. Remove the chicken from the fridge, dip in the seasoned flour, egg and the cheese crumbs. Fry for two minutes on each side, or until golden. Transfer to the pre-heated oven for 25 minutes.