French Toast Cake Pop

Name: French Toast Cake Pop
Ingredients: 2 sticks (1 cup) unsalted butter, at room temperature, plus more for buttering the cake pans; 2 3/4 cups cake flour, plus more for dusting the cake pans; 2 tablespoons ground cinnamon; 2 1/4 teaspoons baking powder; 3/4 teaspoon fine salt; 2 cups granulated sugar; 4 large eggs, at room temperature; 1 cup whole milk; 2 tablespoons pure vanilla extract; 4 cups powdered sugar; 1/2 cup pasteurized egg whites; 8 sticks (4 cups) salted butter, at room temperature; 1 tablespoon ground cinnamon; 1 tablespoon pure vanilla extract; 2 pounds white melting wafers, such as Merckens or Clasen, or tempered white chocolate; 1/2 cup whiskey, such as Fireball Whiskey, optional (if using pipettes)