Pour one-third of custard over wafers and bananas.
Slice bananas and place on top of wafers.
To layer your banana pudding, begin by placing vanilla wafers on the bottom of a 13x9 baking dish, glass bowl, or another 3-quart container.
Lightly beat egg yolks and combine with milk in a large bowl or measuring cup. Pour the egg and milk mixture into dry ingredients in heavy saucepan. Cook over low to medium heat, stirring constantly, until ingredients are thickened and smooth. Remove saucepan from heat and stir in vanilla.
Combine flour, sugar and salt in a large, heavy saucepan.