01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium bowl, combine flour, sugar, and salt for the base. Cut in the butter until the mixture resembles coarse crumbs. Press evenly into the prepared pan.
03 - Bake the shortbread base for 12–14 minutes, until just set but not browned.
04 - In a separate bowl, whisk together eggs and sugar until pale. Add matcha powder and flour, whisking until smooth. Stir in milk, vanilla, and salt. Fold in chopped pistachios.
05 - Pour the green layer over the baked base. Return to the oven and bake for an additional 18–20 minutes, or until the center is just set.
06 - Cool completely in the pan on a wire rack. Lift out using parchment, slice into 16 bars, and serve.