Preheat the oven to 350 degrees Fahrenheit.
In a large bowl, add the flour, sugar, matcha powder, baking powder and salt.
In small bowl whisk together the milk, oil, egg and vanilla.
Add the wet ingredients to the bowl of dry ingredients and mix them together.
Fill the muffin tins and bake for 15-20 minutes or until a toothpick comes out clean.
Melt the butter, add the lemon juice and mix together.
Whisk up to a cup of powdered sugar until you get the consistency you desire.
Drizzle over the muffins and sift matcha powder on top.
