Preheat oven to 400 degrees.
Cut chicken breasts into strips.
In a medium sized bowl, mix together mayo, dijon, and egg yolk. Add some black pepper and salt and stir well.
Add the chicken strips to the mayo mixture and stir until they are all coated.
Add 1/2 cup of vegetable oil to a small pan over medium heat. Once the oil is hot (test the heat by adding a pinch of panko - if the panko bubbles, the oil is ready), add 2 cups of panko to the oil and stir well. *Note - Substitute for panko: Add slices of bread (about half a loaf) to a food processor and chop roughly. Add a small handful of saltines if you want some added crunch.
While the panko is browning, cover a baking sheet with foil and top with a wire rack. Spray the rack with cooking spray.
Once the panko has browned in the pan (be sure not to burn it), transfer it to a large plate. One by one, roll the coated chicken in the panko and add each piece to the wire rack.
Once you have all the chicken coated with panko and onto the rack, bake for 10-12 minutes.
Serve with your favorite dipping sauce!