01 - Preheat the oven to 350°F. Grease and line an 8-inch square baking pan with parchment paper.
02 - In a bowl, whisk together flour, ground ginger, cinnamon, cloves, nutmeg, baking soda, and salt.
03 - In a large bowl, cream the softened butter and brown sugar until light and fluffy.
04 - Beat in the molasses and egg until fully combined.
05 - Add the flour mixture to the wet ingredients in three parts, alternating with milk, beginning and ending with flour. Stir until just combined.
06 - Pour the batter into the prepared pan and smooth the surface evenly.
07 - Bake for 22 to 25 minutes or until a toothpick inserted into the center comes out clean.
08 - Allow the gingerbread to cool completely in the pan on a wire rack.
09 - Whisk powdered sugar, 1 tablespoon of milk, and vanilla extract until smooth. Add additional milk if necessary to achieve a thick yet pourable consistency.
10 - Spread the icing over the cooled gingerbread. Let it set for 15 minutes before slicing into 16 squares.