Keep Paneer Pieces in salted warm water for 15 minutes.This step is mainly for store bought Paneer . If you have home made Paneer you don't need to do this .
In a pan add makhani sauce and warm water and let it simmer 2-3 minutes.
Add Paneer cubes ,kasoori methi ,and heavy cream (optional)and let it simmer for 4-5 minutes.
Taste it and adjust the seasoning . If you want your curry more on sweeter side add 0ne tsp of honey to it .
Add cashew paste . Simmer it for 4-5 minutes on very slow flame .
Check the consistency if its too thick then add little bit of water .
Switch off the flame .
Serve with rice or roti .