Cut the chicken breast into bite-sized pieces.
Slice the onion and bell pepper into thin strips.
Season the chicken breast with salt and pepper.
Heat olive oil in a preheated pan and stir-fry the chicken breast.
Add the vegetables and stir-fry together.
Mix erythritol, vinegar, soy sauce, and water to make the sauce.
Pour the sauce over the stir-fried ingredients and simmer.
Once cooked, plate and serve.