Combine first 3 ingredients in a large saucepan.
Whisk in milk, half-and-half, and egg yolks.
Cook over medium heat, whisking constantly, until smooth and thickened.
Remove from heat, and stir in chocolate morsels and 1 tablespoon vanilla.
Reserve 14 wafers.
Arrange one-third of remaining chocolate wafers in the bottom of a 4-quart baking dish.
Slice 2 bananas, and layer over wafers.
Top with one-third of pudding mixture.
Repeat layers twice and arrange reserved wafers on top.
Beat egg whites at high speed with an electric mixer until soft peaks form.
Gradually add 1/3 cup sugar, 1 tablespoon at a time, beating until stiff peaks form.
Fold in 1/2 teaspoon vanilla.
Spread meringue over pudding, sealing to edge of dish.
Bake at 325° for 25 minutes or until golden.