Preheat oven to 375 degrees. Use non-stick spray to lightly coat a cookie sheet.
Pour the muffin mix into a large bowl. Add egg, yogurt and water. Stir to mix batter. Batter will be thick.
Rinse and drain the cranberries that come with the mix and stir into batter.
Pour mixture onto a lightly floured surface and pat together to make a flat round about 1" thick. Add flour if needed.
Cut the round into 8 triangles by slicing in half, then fourths, then 8 triangles.
Carefully place onto a lightly greased baking sheet.
Bake for 15-20 minutes. Slightly cool; remove to a baking rack to cool completely.