Place the chicken thighs in a Ziploc freezer bag, and tenderize with either a meat tenderizer, rolling pin, or something else that won't break/shatter.
Remove from freezer bag, season both sides of the chicken with salt and pepper, then dust the chicken with flour.
Scramble an egg in a large mixing bowl, then coat each chicken thigh with egg.
Add panko to another large mixing bowl, and fully coat each thigh with panko breadcrumbs.
In a large frying pan, heat oil on medium-high. When hot, add chicken and fry for at least 3 minutes on each side until it is golden brown. When set on a plate with a paper towel to absorb excess oil.
Place chicken on a cutting board and cut into strips.