Preheat oven to 350 F and line a baking pan with aluminum foil (or use a bundt pan).
Beat butter + eggs together with a whisk until smooth, then add coconut + evaporated milk and vanilla extract and stir to combine.
In a separate bowl, mix together the glutinous rice flour, sugar, baking powder and matcha powder (or cocoa powder).
Mix the dry ingredients to the wet mixture and pour it into the baking pan.
Bake for 60 minutes, or until it passes the toothpick test*.
Let cool slightly and sprinkle with shredded coconut.
Notes
*It'll still be slightly jiggly though because it's mochi!
This is freezer-friendly, but likely won't last long enough for you to store it in the freezer! :P