Turn the oven on to 300 degrees. Spread panko breadcrumbs on a baking sheet that has been sprayed with cooking spray. Toast in the oven for 5 minutes. Once done remove from oven and set aside. Mix in the flax seed powder.
Prepare the chicken tenders by using a meat mallet to make sure they are the same thickness. This ensures even cooking. Cut chicken to the desired size making sure they are close in size,
Prepare the batter in a medium bowl. Add in beaten egg, mayo, mustard, and seasoning. Add the chicken pieces and make sure all the chicken pieces are nicely coated.
Take each chicken tender and place it on the panko and flax mix. Make sure the chicken is coated on each side. Continue until all chicken pieces are coated.
Place in the air fryer and cook for 12 min. Flip at the halfway mark. To make sure they are fully cooked you can insert a kitchen thermometer, it is cooked once the internal temp of chicken reaches 165 F. If you are using the oven bake at 375 for 12-15 minutes. Be careful and avoid overcooking as the chicken will dry out. Enjoy with your favourite dipping sauce.