Cut chicken into about 12 evenly sized pieces.
Whisk egg and water in one shallow bowl. In a second bowl, mix flour, garlic powder, cayenne, coriander, salt, and black pepper. Place panko in a third bowl.
Dip chicken into egg wash, then flour mixture, back into egg wash, and finally into panko. Place breaded chicken on a lined baking sheet and refrigerate for 20 minutes.
Mix mayonnaise, sweet chili sauce, hot sauce, and rice vinegar to make the bang bang sauce. Set aside.
Heat oil in a skillet over medium heat. Fry chicken in batches for about 3 minutes per side until golden brown and fully cooked.
Slice rolls in half and lightly toast. Spread bang bang sauce on the bottom bun, add lettuce, top with crispy chicken, drizzle more sauce, and cover with the top bun.
Serve immediately and enjoy your Bang Bang Chicken Sliders.