In a bowl add yogurt and baking soda, give it a good mix and let it rest for couple of minutes. You will see that the yogurt will begin to fluff up and form small bubbles.
At this point add milk, jaggery, melted butter and whisk until everything is properly combined.
Lastly sieve in the ragi flour, cocoa powder, baking powder and gently fold the dry ingredients in without overmixing until a smooth lump-free batter is achieved. Top it up with chocolate chips.
Microwave the same bowl for 3 minutes on regular heating mode or till a skewer comes out clean. Serve the cake immediately.
Recipe by Bake with Shivesh at https://bakewithshivesh.com/3-minute-ragi-chocolate-cake/