In a bowl, mix 200 grams of minced chicken, 1 finely chopped onion, 2 tablespoons of chopped coriander leaves, 1 teaspoon of ginger-garlic paste, 1 teaspoon of soy sauce, salt, and pepper. Set aside for 10 minutes to marinate.
Prepare the dough by mixing 200 grams of all-purpose flour (maida) with water and a pinch of salt. Knead until smooth and let it rest for 15 minutes.
Roll out the dough into thin circles and place a spoonful of the chicken mixture in the center. Fold and seal the edges to form momos.
Steam the momos in a steamer for 15-20 minutes or until cooked through.
In a pan, heat 2 tablespoons of oil and sauté 1 chopped onion, 1 tablespoon of minced garlic, and 1 tablespoon of minced ginger. Add 2 chopped green chillies and 1 chopped capsicum, and cook for 2 minutes.
Add 2 tablespoons of soy sauce, 1 tablespoon of red chilli sauce, 1 tablespoon of tomato ketchup, and salt to taste. Mix well.
Toss the steamed momos in the prepared sauce and cook for 2-3 minutes until well coated.