Line a 9-inch springform pan with parchment; lightly grease the sides.
Stir graham crumbs, granulated sugar, salt, and melted butter until the mixture resembles damp sand.
Press crust firmly into the pan bottom. Chill while you make the filling.
Beat softened cream cheese until smooth and fluffy, about 1 minute.
Mix in powdered sugar and vanilla until silky with no lumps.
Blend in sour cream just to combine; do not overmix.
Whip the cold heavy cream to medium peaks in a separate bowl.
Fold the whipped cream into the cream cheese mixture in two additions until light and airy.
Fold in the mini chocolate chips, reserving a handful for garnish if desired.
Spread the filling over the chilled crust and smooth the top. Sprinkle extra chips and drizzle chocolate sauce.
Chill at least 4 hours, or until set. Slice with a warm knife and serve cold.