Crack eggs into a medium sized bowl. Add soy sauce and pepper. Whisk with a fork until well combined.
In a medium sized non-stick pan, heat oil. Add onions and chili. Fry until fragrant, about 2 minutes.
Add Chinese chives and fry for another minute or so.
Reduce heat to medium. Pour in eggs to cover base of pan. Allow eggs to cook and set for about 2 minutes.
Fold omelet in half using a spatula.
Cut folded omelet in half with edge of spatula. Flip omelet over and allow it to cook and brown for another 2 minutes.
Remove and serve immediately.