Popcorn chicken - better than KFC!

Ingredients

For 4 servings

• 500g / 1lb chicken breast (, skinless boneless, tenderloin or boneless thighs (Note 1))
• 3/4 cup buttermilk ((Note 2 for yogurt/milk sub))
• 1 1/2 tsp cooking salt / kosher salt ((Note 3))
• 1 large egg ((~50 - 55g, 2 oz in shell))
• 1 1/2 cups flour (, plain / all purpose)
• 1/2 cup corn flour / cornstarch ((makes it crispy!))
• 1 tsp cooking salt / kosher salt ((Note 3))
• 1/2 tsp celery salt ((sub 1/4 tsp extra salt))
• 1 tsp black pepper
• 1 tsp regular paprika ((aka sweet paprika, not hot or smoked))
• 1 tsp dried thyme (, crushed with fingers to make it finer)
• 1 tsp dried oregano (, crushed with fingers to make it finer)
• 3/4 tsp onion powder
• 2 tsp garlic powder
• 1/2 tsp mustard powder
• 1/2 tsp ginger powder
• 1/4 tsp cayenne pepper (, optional (tiniest background warmth, doesn't make it spicy))
• 2 1/2 - 3 1/2 cups canola oil (2.5 cm / 1" depth) (, or vegetable or peanut oil (Note 8 for re-use))
• 1/2 batch Honey mustard dipping sauce ((pictured in post))
• Ketchup, tomato sauce,