In a medium bowl(not a plate like below), mash bananas using a fork or your hands. Don't mash too fine if you like seeing banana chunks in your gulgula.
Add flour, baking powder, brown sugar, salt and ground cinnamon.
Mix until smooth. If the bananas are ripe enough you will need no liquid.
If by rare chance the mixture seems dry, add water or milk 1 tablespoon at time until it has the right consistency.
Heat 2 inches of frying or vegetable oil in a small, narrow frying pan over medium heat.
Using two spoons, trying creating a small ball by moving the batter back and forth between spoons--in a 'scooping up" motion. Please see video for another shaping option.
Working in batches, carefully drop heaping tablespoons of batter into the hot oil.
Fry, turning once, until golden brown, about 8 minutes per batch. If you use enough oil they usually flip over by themselves.
Transfer to a paper-towel lined baking sheet using a slotted spoon. Let rest a minute or two before serving.
Video
Notes
Warning: this recipe makes about 20 - Don’t eat them all at once.