Okay, so we guess, when we talk about doughnuts, we cannot really ignore Mad Over Donuts. With multiple outlets across Delhi, they have the softest dough and also the yummiest. They're currently offering mango-filled donuts which you should definitely try because hey, it's mango season.
Just in case, you are someone who hasn't been to M.O.D (which we highly doubt), do try their Double Trouble Donut or Choco Bomb.