Wash the chicken breast fillets and cut into thin slices approximately 0.5 cm thick.
Mix salt, pepper, and vegetable stock into the breadcrumbs.
Place flour, beaten eggs, and seasoned breadcrumbs each on separate plates. Coat each chicken slice in flour and shake off excess, dip in beaten egg, then press into breadcrumbs, turning to coat all sides.
Heat butter or oil in a large pan over medium-high heat.
Once hot, add breaded chicken slices (work in batches if needed to avoid overcrowding) and fry for 3-4 minutes on each side until golden brown and the chicken reaches an internal temperature of 74°C (165°F).
Transfer cooked nuggets to kitchen paper to drain excess oil.