Heat oil, butter and add fennel seeds.
Once it browns add onions and ginger garlic paste.
Saute and add cashews and tomatoes.
Add all spice powders along with salt.
Add little water and allow it to boil nicely for 15-20 minutes.
Cool down the mixture and transfer to blender
Grind to smooth paste
Add water to paste and allow it to boil again.
Once it boils add the chicken Tikka pieces to gravy and mix.
Now add kasturi methi leaves and mix.
Then add cream/milk and allow it cook for few minutes.
Garnish with coriander leaves
Serve chicken tikka masala