Lemon Shortbread Cookies

Ingredients

• 1/2 cup butter, softened
• 1/3 cup sugar
• 4 teaspoons grated lemon zest
• 1 teaspoon vanilla extract
• 1 cup all-purpose flour
• 2 tablespoons plus 1-1/2 teaspoons cornstarch
• 1/4 teaspoon ground nutmeg
• 1/8 teaspoon salt
• DRIZZLE:
• 1/2 cup confectioners' sugar
• 2 to 3 teaspoons lemon juice