Cut the thawed chicken breast into bite-sized pieces.
Heat a spoonful of olive oil in a pan, add the chicken breast and sauté until lightly browned, then add the onion and cook together.
Add the prepared sauce (3 parts soy sauce, 2.5-3 parts water, 1 part allulose, 1 part cooking wine) and simmer over medium-low heat.
Once reduced, pour in a beaten egg, cover with a lid, and cook for 2-3 minutes.
Place on top of rice and serve.