| 1 Cup Soft Butter at room temperature |
| 11/2 Cups Flour |
| 1/2 Cup Powdered Sugar |
| 1/2 Cup Corn Starch |
| 1 Tbsp. Key Lime Juice |
| 2 Tsp. Key Lime Zest |
| Frosting |
| 1/4 Cup Soft Butter |
| 3/4 Cup Powdered Sugar |
| 1Tbsp. Key Lime Juice |
Cream butter, cornstarch, and confectioners sugar until well-combined, not fluffy, about 3 minutes on medium speed with an electric mixer. Add flour to the butter mixture just until well-combined. Add key lime zest and juice. Beat until mixed thoroughly and soft dough is formed.
Divide dough into halves. Form each half into 1 inch roll. Wrap in waxed paper and refrigerate at least 1 hour or until firm.
When ready to bake, preheat oven to 350°. Slice dough into ¼ inch slices. Place on cookie sheet lined with parchment paper and bake for 10 minutes or until set. Cookies will not brown.
Frosting
Cream butter and powdered sugar. Add key lime zest and juice. Beat until fluffy. Spread frosting on tops of cookies.