Preheat the oven to 425 degrees. Add muffin tin liners to your muffin pan and set aside.
In large mixing bowl, whisk together the melted butter, milk and eggs. Add the sugar and whisk until it has completely dissolved, then add in the vanilla extract.
Add in the dry ingredients and whisk until most of the lumps are gone. There will a few lumps left even after you've mixed it well, that's okay.
Using a cookie scoop portion the mochi muffin batter into your prepared muffin tin, filling each one about ¾th of the way full.
Put into the oven and immediately turn the heat down to 350 degrees.
Bake for about 25-30 minutes or until the muffins are just golden brown on top.
Remove them from oven, let cool a few minutes and then move to a wire rack to cool the rest of the way.
Notes
The muffins will come out of the oven with a slight dome on them. Don't be surprised if they sink a bit and get a little crackly on top as they cool. This is totally normal!You can also skip using the paper muffin liners if you would like. If you choose not to use them, spray the muffin tin with baking spray before filling with the batter.