Wash the chicken pieces and pat dry. Marinate the chicken with green chili paste, ginger-garlic paste, yogurt, lemon juice, garam masala powder, ground black pepper, sugar and salt to taste.
Keep in the refrigerator for 2 hours. Overnight works even better.
Add bell pepper and onion pieces into the chicken marinade. Add the olive oil to the chicken and mix well.
Arrange the chicken, onion and bell pepper pieces alternatively on a skewer.
Heat a non stick tawa, grease with a little oil, place the skewers and cook over a low flame.
Once the chicken pieces are slightly brown, turn the skewers over. Cook till uniformly brown and a skewer inserted into the chicken comes out clean.
Serve hot.