Line baking sheets with silicone mats or parchment paper, and preheat oven to 350 degrees F.
In medium sized mixing bowl, whisk flour, corn starch baking soda, salt, and lemon zest until combined.
In stand mixer, combine butter and confectioners’ sugar, and beat until light and creamy. Add eggs, and whip another two minutes. Mix in lemon juice and vanilla.
Combine dry ingredients with wet ingredients, and mix just until fully incorporated.
Roll into 1 inch balls and flatten with a glass that has been dipped in granulated sugar. Bake at 350 degrees for 12-15 minutes. They should be dry and fully baked, but not brown.
Glaze Directions:
Combine all glaze ingredients in a medium-size mixing bowl, and whisk until completely blended. Dip cool cookies into glaze, and allow to set up on wire rack placed over parchment or wax paper. Top with sprinkles, if desired.
Allow glaze to set up, and then store cookies in an air-tight container in the fridge for up to a week.