01 - Preheat oven to 350°F and line an 8-inch square baking pan with parchment paper.
02 - Whisk together flour, granulated sugar, ground ginger, cinnamon, baking powder, and salt in a large bowl.
03 - In a separate bowl, whisk melted butter, eggs, grated ginger, milk, vanilla extract, and lemon zest until blended.
04 - Pour wet mixture into dry ingredients and stir until just combined.
05 - Spread batter evenly into the prepared baking pan.
06 - Bake for 22 to 25 minutes, or until a toothpick inserted in the center comes out clean.
07 - Allow bars to cool completely in the pan on a wire rack.
08 - Whisk powdered sugar and lemon juice until smooth and pourable, adjusting juice to desired consistency.
09 - Drizzle glaze over cooled bars, let set, then cut into 12 squares.