Preheat oven to 200°C / 390°F.
Cut chicken into bite-sized pieces.
Line a baking tray with aluminum foil and lightly grease it.
Prepare 3 bowls. Place cornstarch in the first bowl, beaten egg and 1/2 tsp salt in the second bowl, and panko crumbs and the rest of the seasoning in the third bowl. Mix the seasoning until well combined with panko crumbs.
Dip a piece of chicken into the cornstarch, then egg, then panko crumb mixture. Transfer to prepared baking tray. Repeat with the rest of the chicken.
Spray crumbed chicken very lightly with cooking spray. Transfer to oven and bake for 15 minutes or until golden brown and cooked through on the inside.
Serve immediately with your favorite sauces.