Step 1

Using the flat side of a meat mallet, lightly flatten chicken pieces between two pieces of plastic wrap to an even thickness. In a bowl or resealable bag combine soy sauce, the 1 Tbsp. sesame oil, mirin (if using), and garlic. Add chicken; turn to coat. Cover or seal, and chill 30 to 90 minutes.

Step 2

In a shallow dish stir together flour, 1 tsp. kosher salt, and 1/8 tsp. ground black pepper. In a shallow bowl whisk together egg, mayonnaise, and mustard (if using). In another shallow dish combine panko and sesame seeds.

Step 3

Remove chicken pieces from marinade; discard marinade. Coat chicken pieces with flour mixture, then dip in egg mixture. Coat with panko mixture, pressing to adhere. Coat one side of chicken pieces with olive oil nonstick cooking spray.

Step 4

Preheat air fryer to 400°F.** Add chicken to basket, oil spray side up, and cook 4 minutes. Turn chicken, coat with additional olive oil cooking spray, and cook 4 to 5 minutes more or until golden brown and chicken reaches 165°F.

Step 5

Serve chicken between slices of bread or on buns with desired toppers. lf you like, drizzle with additional sesame oil to serve. Makes 4 sandwiches.