Add eggs, one at a time, mixing well after each one.
Add cake mix slowly, alternating between water and mix.
Stir until combined.
Pour into pans.
Bake for 20-25 minutes.
DO NOT OVERBAKE!
Filling:
In a small bowl, combine water and salt until salt is dissolved; Cool.
In a small bowl, beat remaining ingredients until light at fluffy.
Add salt mixture.
Put marshmallow mixture in a ziplock (or pastry bag) and insert a pastry tip.
Frost.
Ganache:
Melt chips (in a saucepan or the microwave).
Mix chips with cream and stir until smooth.
Assembly:
After cupcakes are assembled, cut a small hole in the bottom. Fill the cupcake with the marshmallow creme, immediately follow by dipping in peanut butter, and place in a second cupcake liner to contain all the goodness. Put in refrigerator until set-