In a pan/kadai heat 2 tbsp oil, add 1 finely chopped onion to hot oil and saute until onion turns translucent.
When onion turns translucent add 2 finely chopped garlic cloves, saute for few seconds,now add 3/4 tsp ginger paste ,cook for few more seconds.
Now add 1 tsp turmeric, 2 tsp each of cumin, red chili, coriander & 1 tbsp garam masala powders,to onion mixture.mix well and saute for few seconds.
Add 3 cups boiled chickpeas, 2 cups diced tomatoes and salt to taste,mix everything nicely with onion spice mixture.
Cover and cook on low heat for 15 mins, stirring once or twice in between.
After 15 minutes,add 400 ml coconut milk to chickpeas, and simmer for 5 more minutes.
Meanwhile lets prepare cornflour slurry,in a small bowl take 1 tsp cornflour, add 2 tbsp water to cornflour mix well and make a lump free smooth slurry.
Add the ready slurry into the chickpea masala,stir well and cook for few minutes.
Turn off the heat ,crush kasuri methi between your palm and add to chickpeas masala.
Chole tikka masala is ready ,serve with steam rice.