Step 1

In a stand mixer, cream the butter and 1/3 cup of the icing sugar until fluffy.

Step 2

Add the lime zest, the lime juice, and the vanilla and beat until fluffy.

Step 3

In a bowl, whisk together the flour, the salt, and the cornstarch.

Step 4

Add the flour mixture to the butter mixture and beat on low speed until combined.

Step 5

Roll the dough into two (2-inch diameter) logs.

Step 6

Cover the dough logs with wrap and chill in the fridge for at least 1 hour.

Step 7

Preheat the oven to 350 degrees F.

Step 8

Slice the dough into 1/8-inch-thick rounds.

Step 9

Place the cookies on baking sheets, about 1-inch apart.

Step 10

Bake the cookies until golden, about 15 minutes.

Step 11

Allow the cookies to cool on a wire rack.

Step 12

While still warm, toss the cookies with the remaining icing sugar.

Step 13

Serve.