Cut the chicken breast into bite-sized pieces.
Cut Vienna sausages into 2-3 pieces each.
Slice the onion and bell pepper into bite-sized pieces.
Heat olive oil in a pan and stir-fry the chicken breast.
When the chicken is about half cooked, add the sausages, onion, and bell pepper and stir-fry together.
Add tomato ketchup, oyster sauce, and pepper, then stir-fry well to combine.
Once everything is cooked, transfer to a plate and enjoy.