1/2 cup butter
1 cup white sugar
1 egg yolk
1 1/2 cups all-purpose flour
1 tsp. baking powder
1/2 tsp. salt
1/4 cup fresh lime juice
1 1/2 tsps. grated lime zest
1/2 cup confectioner's sugar for decoration
Preheat oven to 350 degrees. Grease cookie sheets.
In a large bowl, cream butter, sugar, egg, and egg yolk until smooth.
Stir in lime juice and lime zest.
Combine the flour, baking powder, and salt; blend into the creamed mixture.
Form dough into 1/2 inch balls, and arrange on the prepared cookie sheet.
Bake 8 to 10 minutes in the preheated oven, or until lightly browned. Cool on wire racks.
Sift confectioner's sugar over cookies while still warm.