To make this cake, take a glass bowl and mix yoghurt with baking powder, baking soda, stevia or sugar-free pellets, salt, vanilla essence. Once done, keep aside for 10 minutes. Meanwhile, preheat the oven.
After 10 minutes off yoghurt mixing, add cocoa powder along with ragi flour and oil, and mix vigorously. Add a little water and prepare the cake batter, and make sure there are no lumps remaining.
Take a cake tin and grease with butter. Line with parchment paper and transfer the cake batter into the greased cake tin. Place it inside the preheated oven, and bake for 30-40 minutes at 180 degrees Celsius. Do a toothpick test before taking out the cake from the oven.