In a large pot or wok, heat the cooking oil over medium heat.

Add the chopped onion and minced garlic, stirring until fragrant and the onion becomes translucent.

Add the chicken pieces to the pot, cooking until they are browned on all sides.

Sprinkle salt and black pepper over the chicken, mixing well to ensure even seasoning.

Pour in the water, bringing the mixture to a boil.

Add the diced potatoes, sliced carrots, and green peas to the pot.

Mix in the soy sauce and let everything simmer for about 30 minutes.

Finally, add the sliced bell peppers and cook for an additional 5 minutes.