In a non-stick pan, add a tsp of ghee, condensed milk, paneer and thandai powder.
Mix well and start cooking the mixture on low flame. Keep stirring the mixture.
When the mixture starts to thicken. switch off the flame.
Add white chocolate chips, mix well, til it melts.
Keep aside the mixture to cool.
Then add mango puree and mix well.
Transfer to the tart shells and chill 4-5 hrs or till serving,
Garnish with finely chopped Pistachios or almonds.