Step 1

Preheat oven to 350°F. Lightly brush a 9-inch round cake pan with clarified butter. Line pan with a 13-inch parchment round; brush parchment.

Step 2

Place 1 phyllo sheet on a work surface, with one long side parallel to edge. Lightly brush phyllo with clarified butter. Using your hands, loosely ruffle phyllo by pushing long sides toward each other to create a long accordion shape, about 1 1/2 to 2 inches tall. Place upright in center of prepared cake pan, folding around to create a spiral. Repeat process with remaining sheets, continuing spiral outward until bottom of pan is covered. Brush remaining clarified butter over tops of phyllo ruffles in pan. Bake until golden brown, 25 to 30 minutes. Transfer pan to a wire rack and let cool while making filling (leave oven on).

Step 3

In a large bowl, whisk together eggs, pumpkin, milk, cream, granulated sugar, vanilla, cardamom, cinnamon, and salt until smooth. Transfer mixture to a measuring cup or pitcher. Gradually pour over baked phyllo, evenly covering surface. Return pan to oven and bake until filling is set, 35 to 45 minutes. Transfer to a wire rack; let cool completely. Use parchment to lift pie out of pan; carefully remove parchment and transfer pie to a platter. Dust with confectioners' sugar and serve.