Cut the tofu and chicken breast into bite-sized pieces.
Finely chop the green onion, garlic, and ginger.
Heat cooking oil in a pan and sauté the green onion, garlic, and ginger.
Add the chicken breast and stir-fry until cooked through.
Add doubanjiang, soy sauce, and cooking wine, then stir-fry together.
Add the tofu and mix well.
Pour in water and chili powder, then bring to a simmer.
Add starch water to thicken the sauce.
Finish with a drizzle of sesame oil and serve on a plate.