Preheat your oven to 350°F (175°C). Grease a 9x5 inch loaf pan.
In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
Stir in the cranberries and orange zest.
In another bowl, combine the orange juice, vegetable oil, and beaten egg.
Add the wet ingredients to the dry ingredients, stirring just until moistened.
Pour the batter into the prepared loaf pan.
Bake for 55 minutes, or until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.