Key lime white chocolate cookies

Ingredients

• 2 c. all-purpose flour
• 1 tsp. baking powder
• ¼ tsp. salt
• ½ c. (1 stick) butter, softened
• 1 ¼ c. granulated sugar
• 1 lg. egg
• 1 egg yolk
• ¼ c. key lime juice
• 1 ½ tsp. grated lime peel
• 1 c. white chocolate chips