Spray a 10-inch springform pan with baking spray. Line bottom with parchment paper, and spray again; set aside.
In a large bowl, combine cookie crumbs, hazelnuts, and brown sugar. Add melted butter, and stir to combine. Press mixture into bottom of prepared pan; place in freezer.
In the work bowl of a food processor, combine blueberries and sugar; pulse until smooth.
In a separate large bowl, and using a mixer at high speed, beat cream cheese until creamy, about 3 minutes. Add ½ cup confectioners’ sugar and yogurt, and beat until smooth. Add blueberry mixture to yogurt mixture, beating to combine.
In a large bowl, beat cream with remaining ¼ cup confectioners’ sugar until stiff peaks form. Add whipped cream to blueberry mixture, and beat until mixture is smooth. Spoon mixture into prepared crust, and freeze for 4 hours. Garnish with blueberries and lavender, if desired. Pie can be stored, in a freezer, in an airtight container for up to 1 week.
Recipe by Victoria at https://victoriamag.com/blueberry-frozen-yogurt-pie-recipe/