Wash the rice a couple of times until the water runs clear. Then soak it in water for at least 6 hours or overnight. This will help soften the rice, making it easier to blend.
In a small bowl, mix the active dry yeast, 2 teaspoons of sugar, and ¼ cup of warm water. Set aside for about 10 minutes or until the mixture becomes frothy.
Drain the soaked rice and transfer it to a blender. Add the cooked rice, yogurt (if using), onion, ginger, and ½ cup of warm water. Blend until you achieve a smooth batter.
Pour the blended rice mixture into a large bowl and add the frothy yeast mixture, sugar, and salt. Stir well to combine. Cover the bowl with a clean cloth or plastic wrap and allow the batter to ferment in a warm place for at least 2 hours. You can as well leave it to ferment overnight ( 8 hours) if you want it more tangy.
When ready to fry, add the baking powder to the fermented batter and stir until well combined.
Add about a quarter teaspoon of oil inside each hole of the masa pan and preheat it over medium heat. You can also use a non-stick pan if you don't have masa pan.
Stir the fermented batter again and scoop the batter into the preheated pan, filling each hole about two-thirds full. Cook the masa for 2-4 minutes on each side or until golden brown and cooked through. Repeat with the remaining batter, greasing the pan as needed.
Serve warm with a spicy pepper sauce, such as Yaji (Suya spice), or a savory soup, like Miyan Taushe or Miyan Kuka. You can also go sweet with honey, maple, or powdereed sugar.