In a bowl, whisk together yogurt and baking soda. Allow it to sit until small bubbles form and the mixture doubles in size.
Add sugar, oil, and milk to the yogurt mixture. Whisk until well combined.
Sift in the dry ingredients: all-purpose flour, cocoa powder, and baking powder. Gently fold to create a smooth batter.
Grease a 5-inch bundt cake pan with butter or oil, then pour in the batter.
Bake at 180°C for 20–25 minutes or until a skewer inserted in the center comes out clean.
For the milk chocolate ganache: Place ½ cup of milk chocolate in a bowl. Pour warm fresh cream over it, let it sit for a minute, and stir until smooth.
Pour the ganache into the center of the cake. Dust with cocoa powder to finish.
Recipe by Bake with Shivesh at https://bakewithshivesh.com/lava-cake/