Preheat the oven to 180°C (356°F).
Add eggs and sugar to a bowl and mix with a whisk.
Add milk and matcha powder; mix well.
Sift whole wheat flour and baking powder into the mixture; stir to combine.
Add olive oil and finish the batter.
Pour the batter into the pan and smooth the surface.
Bake in the preheated oven for 25–30 minutes.
Let cool, then cut into bite-sized pieces.