Nonstick cooking spray, for the pan
One 15.25-ounce box red velvet cake mix, plus necessary ingredients
Four 8-ounce packages cream cheese, at room temperature
1 1/2 cups granulated sugar
1 cup sour cream, at room temperature
2 tablespoons cornstarch?
4 large eggs, at room temperature?
2 teaspoons peppermint extract?
1 teaspoon pure vanilla extract?
8 ounces cream cheese, at room temperature
1/2 cup (1 stick) unsalted butter, at room temperature
1 teaspoon pure vanilla extract
1/8 teaspoon salt
3 to 3 1/4 cups confectioners' sugar??
Chocolate sauce, for drizzling
Chopped chocolate candies, such as Andes and Hershey's Kisses, for decorating
Christmas candies, for decorating?