Preheat oven to 375 F. Line a cookie sheet with parchment paper.

In a large bowl measure the flour, baking powder, baking soda, and salt. Mix well to distribute the baking powder and soda.

Add the butter, and cut in until the flour mixture resembles small peas.

Add the sugar and the cranberries, orange rind (optional) mix well.

In a small bowl mix the yogurt and the egg.

Add the yogurt mixture to the dry ingredients and mix until a soft dough forms.

Gather the dough into a large ball. Place on a floured surface and pat down with your hands into a circle about an inch thick.