Cut the chicken breast(s) horizontally into 4-5mm slices. Cut the slices into thin strips.
Slice the halved chilli into thin strips.
Cook the pasta according to the packet's instructions until al dente.
While the pasta is cooking, heat a wok or large non-stick pan until smoking. Add the oil then the chicken strips and cook stirring constantly until any water has evaporated.
Add the prawns, chilli strips and sesame oil and cook until the chicken starts to slightly brown and the prawns are cooked through.
Add the cooked pasta and stir well for a minute or so.
Add the pepper sauce and reduce stirring all the time until you get the consistency you like.
Serve immediately.
Notes
If you like a hotter sauce then leave the chilli seeds in.