01 - Preheat the oven to 375°F and line a 12-cup muffin tin with paper liners or lightly grease each cavity with oil.
02 - In a large bowl, whisk together the all-purpose flour, matcha powder, baking powder, baking soda, salt, cinnamon, ginger, and nutmeg until thoroughly mixed.
03 - In a separate bowl, whisk the pumpkin puree, light brown sugar, eggs, vegetable oil, milk, and vanilla extract until the mixture is smooth and fully blended.
04 - Gradually fold the wet mixture into the dry ingredients using a spatula, mixing until just combined. Avoid overmixing; the batter should retain a slightly lumpy texture.
05 - Evenly distribute the batter among the prepared muffin cups. Optionally, sprinkle each muffin with pumpkin seeds and coarse sugar.
06 - Transfer the tin to the oven and bake for 22 to 25 minutes, or until a toothpick inserted into the center of a muffin yields no wet batter.
07 - Remove from oven and allow muffins to cool in the tin for 5 minutes. Carefully transfer to a wire rack to cool completely before serving.