'9 ounces white chocolate (about 1 1/2 cups chips or chopped chocolate)'
'8 ounces cream cheese
room temperature'
'6 large eggs
separated
room temperature'
'A 8" round cake pan'
Preheat oven to 350°F
Line bottom of 8" cake pan with parchment paper
Cut a 21x5" strip of parchment, butter or oil parchment, and line sides of pan
Center the pan on a large piece of foil and fold foil up over the sides to prevent water from entering pan
Place white chocolate in a medium heatproof bowl and heat in microwave in 20-second intervals (or set bowl over a saucepan of barely simmering water), stirring occasionally, until melted
Transfer to a large bowl and stir in cream cheese
Let cool slightly, then add yolks and stir to combine
Using an electric mixer on high speed, whip egg whites in another large bowl until stiff peaks form
Add a small portion of egg whites to chocolate mixture and stir just until lightened
Gently fold in remaining egg whites in 2 additions until just combined
Pour batter into prepared pan
Place pan in a baking dish or roasting pan and add warm water to reach halfway up sides of cake pan
Bake cheesecake until set, 40–45 minutes
Turn oven off and leave pan in oven 15 minutes, then transfer to a wire rack and let cool completely
Remove cheesecake from pan, transfer to a platter, and chill until cold, at least 4 hours or up to overnight