For the frosting: Beat together the butter, cream cheese, confectioners' sugar and maple syrup in the bowl of a stand mixer fitted with a paddle attachment (or use a hand mixer) until smooth and creamy.
For the apple-bacon filling: Cook the bacon in a medium skillet over medium heat until the fat renders out and the bacon becomes crispy. Scoop out the bacon and place on a paper-towel-lined plate. Add the apples to the bacon fat and cook over medium heat until the apples are tender, 10 to 15 minutes. Add the maple syrup and cinnamon and cook until sticky and caramelized, 1 to 2 minutes more. Remove from the heat and set aside.
For the crepe batter: Whisk together the cake mix, milk, egg and egg white in a large bowl until smooth. Heat a 10-inch nonstick skillet and spray liberally with nonstick cooking spray. Ladle about 3 ounces of batter into the pan and cook over medium heat until the bottom starts to brown and the top of the crepe begins to bubble, 1 to 2 minutes. Work around the edge of the crepe with a rubber spatula to begin to release it from the pan. Gently flip the crepe over, spraying more nonstick spray as needed. Cook until golden brown and cooked through, 30 seconds to 1 minute longer. Remove the crepe and place on a serving dish. Repeat with the remaining batter.
To assemble: Spread the filling generously over half of each crepe and top with a few tablespoons of bacon. Fold the tops of the crepe over and sprinkle with confectioners' sugar. Sprinkle additional bacon on top if desired.