In a saucepan, combine cornstarch, sugar, salt, whole milk and egg yolks. Stir until well-mixed.
Place saucepan over medium heat and cook, whisking frequently, until mixture thickens (about 8 minutes).
Remove from heat and add butter and vanilla. Whisk until butter has melted.
Let pudding cool at room temperature. Once cooled, pour through a strainer to remove any lumps.
In a large bowl, combine pudding, chopped SNICKERS® Bars and banana slices. Place in a refrigerator until ready to serve.