Frozen White Chocolate Grasshopper Mousse Pie

Name: Frozen White Chocolate Grasshopper Mousse Pie
Ingredients: Nonstick vegetable oil spray; 22 chocolate wafer cookies; 3 tablespoons sugar; 1/4 cup unsalted butter, melted; 1 cup whole milk; Pinch of salt; 3 large egg yolks; 2 tablespoons cornstarch; 6 ounces good-quality white chocolate (such as Baker’s or Lindt), chopped; 2 tablespoons unsalted butter; 2 tablespoons green crème de menthe; 2 tablespoons light crème de cacao; 3/4 cup chilled whipping cream; Shaved white and dark chocolates