01 -
Crush the biscuits fine, mix with melted butter, and press firmly into the base of a 9-inch (23 cm) springform pan. Bake at 325°F (160°C) for 10 minutes until just set, then cool while you make the filling.
02 -
Melt the white chocolate over a double boiler or in short microwave bursts, stirring often so it doesn't seize. Set aside to cool slightly.
03 -
Beat the cream cheese and sugar on low speed until completely smooth, scraping down the bowl often. Avoid high speed, which whips in air that causes cracking later.
04 -
Add the eggs one at a time on low speed, mixing just until each one disappears. Blend in the sour cream, cornstarch, vanilla, salt, and melted white chocolate.
05 -
Toss the blueberries with a spoonful of flour, then fold them gently into the batter by hand so they stay whole and evenly distributed.
06 -
Wrap the pan tightly in two layers of foil and set it in a larger roasting pan. Add hot water until it reaches halfway up the sides and bake at 325°F (160°C) for 55-65 minutes, until the edges are set and the center still jiggles slightly.
07 -
Turn off the oven and crack the door open. Let the cheesecake cool inside for an hour, then refrigerate it uncovered overnight before slicing.