Preheat your oven to 325°F right now.
Wrap springform pan bottom with aluminum foil tightly.
This prevents water from seeping inside later.
Mix cookie crumbs with melted butter thoroughly.
Press mixture into pan bottom firmly and evenly.
Set aside while making your filling next.
Beat cream cheese until completely smooth and fluffy.
Add sugar and mix until well combined.
Beat in eggs one at a time slowly.
Pour in melted chocolate and mix gently together.
Add sour cream and vanilla extract last.
Mix until everything looks perfectly smooth throughout.
Pour filling over your prepared crust carefully.
Place springform pan in large roasting pan.
Add hot water halfway up the sides.
Bake for 55-60 minutes until edges set.
Center should jiggle slightly when done baking.
Turn oven off and crack door open.
Let cheesecake cool inside for one hour.
Remove from oven and cool completely first.
Refrigerate for at least 4 hours minimum.
Overnight chilling works even better for texture.
Before serving, arrange truffle halves on top.
Press them gently into the cheesecake surface.
Your masterpiece is ready to serve now.