Preheat oven to 400. Dip cauliflower in egg, then roll in panko until fully coated and place on baking sheet lined with parchent paper. Press the coating on to help it stick.
Bake for 20 minutes, until coating is a dark golden brown and crunchy.
While cauliflower is cooking, make the bang bang sauce by combining chili and hot sauces, honey and mayo to a bowl, then whisk until uniform. Drizzle over baked cauliflower, reserving some for dipping. Garnish with parsley.