Place first 6 ingredients in a bowl & mix until blended with spoon.
Pour into 13x9 in. cake pan.
Bake at 350 for 35-40 minutes
Poke holes in cake.
Mix butter, sugar and evaporated milk together an cook over medium heat until a little thickened. (Usually takes about 5 minutes at a boil).
Remove from heat and add remaining ingredients.
Immediately pour over hot cake.