Key Lime Melt-Aways

Here is a twist on one of my favorite cookies...

Key Lime Melt-Aways
[Yield: 5 dozen]

1-1/2 sticks unsalted butter at room temperature
1 cup confectioner's sugar
Grated zest of 4 tiny or 2 large key limes
2 Tbsp. freshly squeezed lime juice
1 Tbsp. pure vanilla extract
1-3/4 cups + 2 tbsp. all.purpose flour
[aka: 2 cups minus 2 tbsp.]
2 Tbsp. cornstarch
1/4 tsp. salt

In the bowl of an electric mixer, fitted with the whisk attachment,
cream butter and 1/3 cup sugar until fluffy. Add lime zest,
juice, and vanilla. Beat until fluffy.
In a medium bowl, whisk together flour, cornstarch, and salt.
Add to butter mixture and beat on low speed until combined.
Between two 8x12 inch pieces of parchment paper, roll dough
into two 1-1/4 inch diameter log. Chill at least one hour.
Heat oven to 350º. Line two baking sheets with parchment. Place
remaining 2/3 cup sugar in a resealable plastic bag. Remove
parchment from logs. Slice dough into 1/4-inch thick rounds.
Place rounds on baking sheets spaced one inch apart.
Bake cookies until barely golden; about 15 min. Transfer cookies
to a wire rack to cool slightly (just 3 or 4 min.). While still
warm, place cookies in the sugar-fill bag. Toss to coat.

Bake or freeze remaining dough. Store baked cookies in an
airtight container for up to two weeks. You can also keep
the logs frozen for up to two months. Use them as
the melt-away craving hits...