Banana Pudding Dessert

This is recipe that Mom made often when we were growing up.  I always thought it was complicated because it was made from scratch, but it's not.  The cream sauce can also be used for a Trifle type dessert.

6 Tablespoons flour
1/2 cup sugar
1/2 teaspoon salt
2 eggs yolks
2 Tablespoons melted butter
3 cups milk
1 teaspoon vanilla

sliced bananas
vanilla wafers

Combine flour, sugar and salt.  Set aside.  In a medium saucepan combine egg yolks, milk and butter.  Add flour mixture.  Cook over medium heat, stirring constantly with a wire whisk.  Cook until sauce thickens (about 10 minutes).  Stir in vanilla.  Let cool.  Layer vanilla wafers, banana slices, then cream sauce in a bowl.   Top with more vanilla wafers. Chill.