01 - Preheat oven to 350°F. Grease and flour a 9x5-inch loaf pan.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
03 - In a separate bowl, whisk orange juice, vegetable oil, and egg until well combined.
04 - Add the wet mixture to the dry ingredients and stir gently until just combined, avoiding overmixing.
05 - Fold in cranberries, nuts, and orange zest if using, mixing evenly.
06 - Pour batter into the prepared loaf pan and smooth the surface evenly.
07 - Bake for 50 to 55 minutes, or until a toothpick inserted in the center comes out clean.
08 - Allow bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.