Key Lime Meltaways

Why I Love This Recipe
This is just a recipe that I got when I was playing around with different recipes. I sort of took a couple of aspects from like three different recipes, modified them a little, and put them together, and this is how it turned out. I was so surprise when I first tried it. Hope you like it.
Ingredients You'll Need
3/4 cup margarine
1cup powdered sugar
2Tsp freshly squeezed key lime juice
2Tsp finely grated lime zest
1Tsp vanilla
1 3/4 cups+2Tsp all-purpose flour
2Tsp cornstarch
1/4 tsp salt
Directions
Beat butter and 1/3cup of the sugar until fluffy with electric mixer. Add lime juice, zest, and vanilla; beat until fluffy.
In medium bowl, whisk flour, cornstarch, and salt. Add to butter mixture and beat on low speed until combined.
Between 2 pieces of parchment paper, roll dough into 2 diameter logs.
Chill at least 1 hour. Preheat oven to 350 degrees.
Line 2 baking sheets with parchment paper. Place remaining sugar in a resealable plastic bag. Remove parchment from log; slice into 1/8-inch thick rounds. Place rounds on baking sheers, spaced 1 inch apart.
Bake until barely golden, about 15 min. Transfer to a wire rack to cool slightly, 8-10min.
While warm, place cookies in the sugar filled bag; toss to coat.
Store cookies in airtight container up to 2 weeks. Bake or freeze remaining dough. Makes approx. 10 dozen cookies.