In a large bowl, use an electric hand mixer on medium speed to cream together the butter, granulated sugar, and powdered sugar until light and fluffy, about 2 minutes. Scrape down the sides of the bowl, then add the egg, McCormick® Vanilla Extract, lemon zest, and lemon juice, and mix until fully combined, about 3 minutes.
2. Step
Add the flour, salt, and McCormick® Dried Thyme Leaves, and mix on low speed until the dough comes together.
3. Step
Transfer the dough to a sheet of parchment paper and use the parchment to roll the dough into a log about 10 inches long and 2 inches wide. Chill the dough in the refrigerator for 1 hour.
4. Step
Preheat the oven to 350°F (180°C). Line a baking sheet with parchment paper.
5. Step
Slice the log crosswise into ½-inch-thick rounds. Place the dough rounds on the prepared baking sheet, spacing about 2 inches apart.
6. Step
Bake the cookies for 12 minutes, or until the edges are golden brown. Transfer to a wire rack and let cool for 10 minutes.
7. Step
Make the glaze: In a small bowl, whisk together the powdered sugar and milk until smooth.
8. Step
Dip the tops of the cookies in the icing or spread the icing over the cookies, then return to the wire rack. Zest the lemon lightly over each cookie. Let the glaze set for about 30 minutes before serving.
