I have too many Coins... more? Yeah, I'll take some more!
―Buttercream Choco Cookie
Buttercream Choco Cookie is a B-grade cookie with the ability to give coin bonus from 5% up to 25%. So it's recommended to level him up very early in the game, as he is one of the best cookies for Coin Farming.
Although his Combo Pet is the Dust Unicorn, players tend to use the Gold Drop or Pirate’s Bomb to get more coins in one run. After upgrading the Cookie to level 8, you get his treasure Buttercream Choco Cookie's Butter which gives an additional 3~4% coin bonus. But there are other treasures with higher coin bonus which are more likely to be used.
Justifying his nickname "Rich", Buttercream Choco Cookie knows how to handle his Coins, with positive return on all investments. He wouldn't share his secret, but a source tells us he particularly likes clean energy.