Preheat your oven to 350°F (175°C) and prepare your muffin tin.
In a large bowl, whisk together the dry ingredients: flour, baking powder, salt, sugar, and matcha powder.
In a separate bowl, mix the wet ingredients: melted butter, buttermilk, and eggs until well combined.
Pour the wet mixture into the dry ingredients, gently folding until just combined. Avoid overmixing.
Fold in the white chocolate chips, ensuring they are evenly distributed in the batter.
Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full.
Bake for 18-20 minutes or until a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the pan for 5 minutes before transferring to a wire rack.
