Mix eggs until nice and yellow then continue mixing in the the remaining cake ingredients. Pour into a 15 x 2 pan and bake for about 15 minutes or until tests done.
Immediately after removing from oven spread the 1 1/3 cup of peanut butter over hot cake. (I don't actually measure the peanut butter, I just use enough to give the cake a nice even layer.) Put aside and let cool. If I'm in a hurry I put it in the fridge to speed things up.
When cake is cool but NOT cold melt the tablespoon of peanut butter along with the milk chocolate in the microwave,about 1 - 1.5 minutes. Spread over cake and cool completely before cutting.