Preheat oven to 350° and line two baking sheets with parchment paper.
In a large bowl, beat butter and sugars together, in a medium bowl, until light and fluffy.
Add vanilla extract, corn syrup, lemon extract and egg and mix until combined.
In a medium bowl, whisk flour, baking powder, baking soda and sat together.
Gradually add dry ingredients into wet ingredients just until combined.
Stir in rainbow mini baking chips.
Roll cookie dough into 1 inch balls and roll in sanding sugar.
Place 2 inches apart on prepared baking sheets.
Bake 15-16 minutes or until edges start to brown and tops have started to crack.
Carefully remove from oven and let sit on baking sheet for 5 minutes then transfer to wire rack to cool completely.
Melt white chocolate wafers in a microwave safe bowl at 30 second intervals until melted, stirring after each 30 seconds.
Using a spoon, drizzle white chocolate over cookies then decorate with candied sprinkles and candied stars, optional.