edible model making..
Whats not to like?
Its really for kids....

1 cup peanut butter (smooth not crunchy)
1 cup icing sugar
1/2 cup cocoa powder
Mix to a dough if sticky add more cocoa...if crumbly add a tiny drop water tsp at a time or a dollop more peanut butter.
play mould then eat!...suppose it could be kept for a week or 2, but it doesnt last that long!