In a ziplock bag, marinate the sliced chicken breast with salt, sugar, and beaten egg. Allow it to sit for 5-10 minutes to let the flavors infuse.
To create a flavorful sauce, combine minced garlic, chili bean sauce, soy sauce, water, sugar, mirin, vinegar, and sesame oil. Set it aside.
Coat the marinated chicken with potato starch, ensuring each slice is evenly coated.
Heat oil in a pan or wok over medium-high heat. Add the asparagus. Stir-fry for a couple of minutes until the asparagus becomes tender-crisp. Sprinkle salt over the asparagus and continue to stir-fry for another minute. Remove the asparagus from the pan and set it aside.
In the same pan, add the coated chicken slices and stir-fry until golden brown and crispy. Pour the sauce over the chicken.
Add the asparagus, and toss. Sprinkle sesame seed.