Whisk all-purpose flour, yogurt, baking powder, and water into a smooth, pourable batter.
Boil sugar, water, saffron, and cardamom powder to form a 1-string sugar syrup; keep warm.
Pour batter into a squeeze bottle and pipe concentric spirals into warm oil.
Fry until crisp and light golden, then immediately soak in warm sugar syrup for 2 minutes.
Serve hot.