1/2 (10-oz.) package shortbread cookies (we tested with Lorna Doone)
1/2 cup unsalted pistachio nuts
1/4 cup sugar
1/4 cup butter, melted
3 (8-oz.) packages cream cheese, softened
1 1/4 cups sugar
1 teaspoon ground cardamom
2 3/4 cups sour cream, divided
1 tablespoon all-purpose flour
1 tablespoon vanilla bean paste or vanilla extract
4 large eggs
5 ounces white chocolate, chopped
Garnish: additional unsalted pistachio nuts
How to Make It
Place first 3 ingredients in a food processor; process until finely ground. Stir in butter. Press cookie crumb mixture into bottom of an ungreased 9" springform pan. Bake at 350° for 15 minutes.
Meanwhile, beat cream cheese, 1 1/4 cups sugar, and cardamom at medium speed with an electric mixer until smooth. Add 1 1/2 cups sour cream, flour, and vanilla bean paste; beat until blended. Add eggs, 1 at a time, beating just until yellow disappears. Pour batter into baked crust.
Bake at 300° for 1 hour and 15 minutes or until almost set. Immediately run a knife around edge of pan, releasing sides. Let cool on a wire rack 10 minutes.
Meanwhile, place white chocolate in a microwave-safe bowl; microwave at HIGH for 1 minute or until chocolate is soft. Stir until smooth. Whisk in remaining 1 1/4 cups sour cream. Spread white chocolate mixture over warm cheesecake. Let cool completely in pan on wire rack. Cover and chill 8 hours. Remove sides of pan. Garnish cheesecake, if desired.