When I was in high school (a very long time ago....), I learned this way of eating mochi from a friend. It's so delicious, I can eat 6 or 7 of these even in the morning, so I gained weight..
This was a forbidden recipe for me until recently.

In Step 3, the best timing is to stop the microwave when the mochi has puffed up and is just about to roll over!!
In Step 5, you can increase the number of chocolate cubes up to 5.
In Step 6, be sure to pinch the edges very securely. This is to prevent the chocolate from melting out from the sides. For 1. Recipe by Honwaka