Whisk together sweetener* and salt in a medium saucepan. Combine cornstarch and water to form a slurry. Add milk, slurry and eggs to saucepan, whisking well to combine.
Bring to a boil over medium-high heat, stirring constantly; cook until thickened. Remove from heat; stir in vanilla.
In individual bowls or jars, layer 8 wafers, half a banana, sliced, and 1/2 cup pudding. Top with whipped cream, if desired.