2-1/2 cups all-purpose flour, divided
1/2 cup confectioners' sugar
3/4 cup cold butter, cubed
2 cups sugar
1/3 cup lime juice
1/2 teaspoon grated lime peel
1/2 teaspoon baking powder
Additional confectioners' sugar
In a large bowl, combine 2 cups flour and confectioners' sugar; cut in butter until mixture resembles coarse crumbs. Pat into a greased 13-in. x 9-in. baking pan.Bake at 350° for 20 minutes or until lightly browned.
In a large bowl, whisk the eggs, sugar, lime juice and peel until frothy. Combine the baking powder and remaining flour; whisk in egg mixture. Pour over hot crust.
Bake for 20-25 minutes or until light golden brown. Cool on a wire rack. Dust with confectioners' sugar. Cut into squares.