Combine soy sauce, brown sugar, sesame oil and chili flakes in a small bowl. Set aside.
Heat non-stick pan over medium high heat, add small amount of vegetable oil, add onions to pan and cook for 1-2 minute. Add garlic and ginger, sauce for additional minute before adding ground chicken to pan. Break up the chicken with a spatula or wooden spoon.
Cook until the chicken loses its pinkness.
Add sauce ingredients to pan and stir to incorporate, reduce heat to medium-low, cover and simmer mixture another 5 minutes.