Cut thawed chicken breast into bite-sized pieces.
Heat 1 tablespoon of olive oil in a pan, add the chicken breast, and cook until golden. Then add onion and sauté together.
Add the prepared sauce (3 soy sauce, 2.5-3 water, 1 allulose, 1 mirin) and simmer over medium-low heat.
Once it has reduced a bit, beat one egg and pour it in, cover with a lid and cook for 2-3 minutes.
Serve on top of rice.