- In a medium saucepan, whisk together the milk, heavy cream, sugar, cornstarch, and salt over medium heat. Continue whisking until the mixture thickens and begins to bubble, about 5-7 minutes. 
- Remove the saucepan from heat and stir in the vanilla extract. Let the pudding cool for about 10 minutes. 
- In a 9x13-inch dish, layer half of the vanilla wafers on the bottom. Top with half of the sliced bananas. Pour half of the pudding over the bananas and wafers. 
- Repeat the layers with the remaining vanilla wafers, bananas, and pudding. 
- Spread the whipped cream evenly over the top layer of pudding. 
- Cover the dish with plastic wrap and refrigerate for at least 4 hours, preferably overnight, to allow the flavors to meld and the pudding to set. 
- Serve chilled and enjoy!