1

Preheat oven to 400°F. Line a large baking sheet with parchment paper.

2

Sift flour, cocoa, and baking powder into a bowl and stir in the sugar. Cut in the butter with a pastry cutter until it is well mixed in and crumbly.

3

Mix together egg, orange juice and rind. Stir into flour mixture. Cover with plastic wrap and chill in refrigerator for 30 to 60 minutes.

4

Place powdered sugar into a small bowl. Shape walnut sized pieces of dough roughly into a ball (you won't be able to make them perfect, and your hands will get messy). Drop balls into the powdered sugar and toss until thickly coated. Place on prepared baking sheet.

5

Bake for about 10 minutes, or until just set. Transfer to a wire rack to cool completely.