Whisk together the flour and baking powder

Grate the peel from the whole orange and mix it with 1/2 cup granulated sugar.

Beat the butter until light and creamy.

Whisk the orange juice and egg together. Add to the butter.

Beat in the orange sugar.

Sift the dry ingredients into the mixture. Beat until combined.

Wrap the dough. Chill for 1 hour

Preheat the oven to 350F. Line 2 baking sheets with parchment paper.

Add the remaining granulated sugar and powdered sugar into 2 separate bowls.

Form the dough into balls. Roll them first in the granulated sugar and then into the powdered sugar.

Place on the baking sheets.

Remove the cookies from the oven.

Transfer to a wire rack to cool completely.