In bowl, add chicken, chicken tikka masala, yogurt, mix well and marinate for 15 minutes.
In frying pan,add cooking oil,marinated chicken and cook until chicken is done (12-15 minutes).
In the center of the frying pan,add cooking oil,onion,capsicum and stir fry for 1 minute then add chicken,mix well & set aside.
In saucepan,add butter and let it melt.
Add all-purpose flour and mix well for 1 minute.
Add milk and whisk well.
Add cheddar cheese,salt,red chili powder,chicken powder,whisk continuously and cook until sauce thickens & set aside.
In frying pan, add butter and let it melt.
Add onion, garlic, mix well and sauté until translucent & set aside.
In bowl, add potatoes and mash well with the help of the masher.
Now add sautéed onion+garlic,baking powder,achar gosht masala,all-purpose flour,eggs and mix until well combined.
Preheat waffle maker and grease with oil,add add prepared batter on waffle iron and spread evenly.
Cook for 8-10 minutes
On serving plate, place waffle, cooked chicken, drizzle white sauce and garnish with green onion leaves & serve!