chicken tender recipe

1 1/2 cups panko breadcrumbs (Note 1) ▢Oil spray Batter ▢1 egg ▢1 tbsp mayonnaise ▢1 1/2 tbsp dijon mustard (or other mustard) ▢2 tbsp flour ▢1/2 tsp salt ▢Black pepper Chicken ▢500 g/1 lb chicken tenderloins (or breast cut into 2/3″ / 1.5cm thick slices, lengthwise) ▢Oil spray