In a large bowl combine:
1/2 c sugar
1 tsp salt
1 egg
1 c milk
1/4 c oil
Add:
3/4 c creamy peanut butter
Mix well.
Stir in:
2 c flour
4 tsp baking powder
1 c marshmallow creme
Pour into a greased 9x5 pan.
Bake @ 350, 60 - 70 minutes or until toothpick poked in comes out clean.
Immediately remove from pan & cool on wire rack.