01 - Whisk together flour, baking powder, and salt in a medium bowl. Set aside for later use.
02 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
03 - Add egg and vanilla extract to butter mixture, mixing until fully incorporated.
04 - Gradually add dry ingredients to wet mixture, mixing just until dough forms. Avoid overmixing.
05 - Divide dough into two discs, wrap in plastic wrap, and refrigerate for minimum 30 minutes.
06 - Preheat oven to 350°F. Line baking sheets with parchment paper.
07 - On lightly floured surface, roll dough to 1/4-inch thickness. Cut egg shapes with cookie cutter.
08 - Place cookies 2 inches apart on prepared baking sheets to allow for spreading.
09 - Bake for 8-10 minutes until edges barely begin turning golden. Cool on sheets 5 minutes before transferring to wire rack.
10 - Whisk powdered sugar, 2 tbsp milk, corn syrup, and vanilla until smooth. Adjust consistency with additional milk as needed.
11 - Divide icing among bowls and tint with gel food coloring to achieve desired pastel shades.
12 - Pipe or spread colored icing onto completely cooled cookies. Allow icing to set fully before serving or storing.