Line bottom of a 9 inch tart pan with parchment paper.
Mix hazelnuts, brown sugar and melted butter.
Press into bottom of pan, and a little up the side.
Melt white chocolate until melted and smooth, stirring often.
Whip cream cheese for about 3 minutes.
Add the melted white chocolate, beat for another minute.
Add sour cream. Beat until very smooth.
Toss clean blueberries with ¼ cup sugar.
Heap on top of cheesecake.
Garnish with White Chocolate shavings if desired.