Chocolate Macarons with Orange Ganache

Name: Chocolate Macarons with Orange Ganache
Ingredients: 2 cups powdered sugar, divided; 1 1/4 cups slivered almonds; 3 tablespoons natural unsweetened cocoa powder; 1/3 cup plus 3 tablespoons egg whites (from about 3 large eggs), room temperature, whisked to loosen; 1/4 cup sugar; 3 1/2 ounces bittersweet chocolate (do not exceed 61% cacao), finely chopped; 2 tablespoons (1/4 stick) cold unsalted butter, cut into 1/2' cubes; 1/2 cup heavy cream; 1 tablespoon finely grated orange zest; 1/2 teaspoon ground cloves; 1/8 teaspoon ground allspice; 1/8 teaspoon kosher salt; Gold dust (optional)