Cut the chicken breast into bite-sized pieces.
Slice the onion thinly.
Heat olive oil in a pan and cook the chicken breast.
Once the chicken is cooked, add the onions and stir-fry.
Add soy sauce, erythritol, mirin, and water to make the sauce.
Place the simmered chicken and onions on top of rice.
Garnish with parsley or green onions.