Shred the chicken breast into bite-sized pieces.
Soak the cup noodle japchae noodles in hot water.
Julienne the onion, carrot, and bell pepper.
Heat cooking oil in a pan and stir-fry the chicken breast.
Add the vegetables and stir-fry together.
Add the soaked japchae noodles and seasoning powder, mixing and stir-frying together.
Season with soy sauce and pepper.
Serve the finished japchae rice in a bowl.