Preheat oven to 400°F.
Season chicken breasts with salt and pepper.
Pour flour into a shallow bowl.
Dredge chicken breasts in flour, turning to coat fully.
Add eggs to another bowl. Whisk the eggs until frothy. Add milk and whisk to make an egg wash.
In another bowl, add panko and chopped macadamia nuts. Mix well.
Take a chicken breast out of the flour and place in the egg wash. Turn to coat fully.
Move chicken to panko mix. Turn to bread the chicken breast fully.
Repeat with remain 3 breasts.
Add butter and oil to a large sauté pan. Place pan over medium heat.
When butter is melted and hot, place chicken breasts in pan (1 or 2 at a time, if they don't all fit).
Brown chicken on both sides. Remove from pan.
Place chicken breasts on a cooking sheet.
Place in preheated oven oven and cook for 15 minutes or until done to an internal temperature of 165°F.
Serve hot.