Prepare the Dough: In a large mixing bowl, beat the softened butter and powdered sugar together until light and fluffy. This should take about 2-3 minutes. Add the vanilla extract, lemon juice, and zest, mixing until well combined. In a separate bowl, whisk together the all-purpose flour, cornstarch, and salt. Gradually add this mixture to the wet ingredients, stirring until a soft dough forms. Wrap the dough in plastic wrap and refrigerate it for 30 minutes to firm it up.

Bake the Cookies: Preheat your oven to 175°C (350°F) and line your baking sheets with parchment paper. Roll the chilled dough into small balls (about 1 tablespoon each) and place them on the prepared baking sheets. Leave about 5 cm of space between each cookie. Gently flatten each ball with your palm. Bake in the preheated oven for 10-12 minutes or until the edges are set but not browned. Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

Make the Glaze: In a small bowl, whisk together the powdered sugar, lemon juice, and zest until smooth. If you want that vibrant touch, add a drop of yellow food coloring and mix well.

Glaze the Cookies: Once the cookies are completely cool, dip the tops into the glaze or drizzle it over each cookie. Allow the glaze to set before enjoying your Lemon Meltaway Cookies!