In a mixing bowl, whisk together the milk, heavy cream, flour, eggs, sugar, melted butter, and salt until smooth. Allow the batter to rest for about 30 minutes.
Heat a non-stick skillet or crepe pan over medium heat. Lightly grease it. Pour about 1/4 cup of batter into the pan, swirling to create a thin layer. Cook for 1-2 minutes, then flip and cook for another 30 seconds. Repeat with the remaining batter.
In a separate bowl, combine the pudding mix with 1 cup of cold milk. Whisk for about 2 minutes until thickened. Gently fold in the thawed whipped topping.
In a microwave-safe bowl, combine the chocolate chips and heavy cream. Microwave in 30-second intervals, stirring until smooth. Let cool slightly.
Take one crepe and place a spoonful of the vanilla pudding filling in the center. Fold over and place on a serving plate. Repeat with remaining crepes.
Drizzle the warm ganache over the filled crepes and serve extra ganache on the side.