Follow instuctions for baking the cake, bake and then let it cool.  Then split both cake layers so you end up with 4 layers.

For the Frosting:
Cook on medium heat for 12 minutes or until it thickens.  (Make sure it is thickened or it will run right off the cake!)  Add vanilla, stir and let cool for one hour.

Cream Filling:
Combine the sugar, cornstarch & salt.  Then add the egg and blend in well.  Stir in milk slowly and cook over medium heat, stirring constantly, until mixture comes to a boil and thickens.  Add butter and vanillia.  Chill 30 minutes.  Spread 1/3 of mixture on each of 3 layers.

Spread the filling then add a cake layer and another filling etc.  Add top layer then spread the frosting over all the cake.  Sprinkle the toasted pecans over top of frosting.