Preheat oven to 350°F (175°C). Grease and line two 8-inch pans with parchment paper.
Sift together flour, matcha, baking powder, baking soda, and salt.
Beat eggs and sugar until pale and fluffy. Add oil, vanilla, and lemon juice.
Gently fold dry ingredients and milk alternately into wet mixture.
Divide batter into pans, tap out bubbles, and bake for 25–30 minutes.
Cool cakes, remove from pans, and prepare matcha buttercream.
Frost cake layers and decorate as desired.