Key Lime White Chocolate Chip Cookies

1/2 cup butter (1 stick)
1 cup sugar
1 egg
1 egg yolk
1.5 cup all purpose flour
1 tsp baking powder
1/2 tsp salt
1/4 cup key lime juice
1.5 tsp grated lime zest
1-1.5 cups white choc chips (1 bag)
1/2 cup powdered sugar (for decoration)

Preheat oven to 350. Grease cookie sheets. In a large bowl cream butter, sugar, egg and egg yolk until smooth. Stir in keylime juice and zest. Combine flour, baking soda and salt; blend into the creamed mixture. Add white choc chips and blend. Form dough into 1/2 inch balls and arrange on the prepared cookie sheet. Bake 9-12 minutes or until lightly browned. Cool on wire racks. Sift powdered sugar over cookies while still warm (Last step is optional.. best served when warm)