01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, salt, cinnamon, and nutmeg. Set aside.
03 - In a large mixing bowl, beat the softened butter and granulated sugar using an electric mixer until light and fluffy, about 2 to 3 minutes.
04 - Add the egg, lemon juice, lemon zest, and vanilla extract to the butter mixture and mix until thoroughly combined.
05 - Gradually add the dry ingredients into the wet mixture, mixing just until incorporated without overworking the dough.
06 - Scoop tablespoon-sized portions of dough onto the prepared baking sheets, leaving approximately 2 inches spacing between each.
07 - Bake for 10 to 12 minutes or until the edges become lightly golden. Remove from oven and let cool on the baking sheet for 5 minutes, then transfer to a wire rack.
08 - Whisk together powdered sugar, lemon juice, and milk in a small bowl until smooth and pourable.
09 - Once cookies are completely cool, drizzle or spread glaze over each cookie. Immediately add sprinkles or edible glitter if desired.
10 - Allow the glaze to set fully before serving or storing.