Sift flour, baking powder and salt into medium bowl.

Using electric mixer, beat butter, lemon peel and tangerine peel in large bowl until light.

Add 1/2 cup sugar and 1/4 cup powdered sugar and beat until fluffy.

Beat in egg.

Add dry ingredients.

Using spoon, stir until mixture forms dough (dough will be soft).

Preheat the oven to 350°F.

Take 1 tsp of cookie dough at a time and roll into a ball in your hands.

Transfer cookies to ungreased nonstick baking sheets, spacing 1/2 inch apart.

Repeat this process until you rolled all of your dough into cookie balls.

Bake until cookies turn lightly brown on bottoms, about 10-15 minutes.

Let cookies stand on sheets 1 minute. Using a small spoon, transfer cookies to a bowl of powdered sugar, rolling them around so they get nice and coated.

Now transfer cookies to cooling rack.

Repeat this process until you have coated all your cookies with powdered sugar.

Let cookies fully cool on cooling rack, about 30 minutes and then enjoy!