The key to this dish is to make chicken tender. Stir-fry over high heat to make sure chicken meat is tender inside and crispy outside.
Do not overcook the peanut. Remove from heat once peanuts turn crispy. You would rather not to fry too long than burn the peanut. Peanut turns bitter when burnt.
Practice made taste better. Even though it is a home recipe, not everyone can make as yummy as the top level. The cook with high-level cooking skills can make the meat crispy outside but tender inside.