01 - Preheat oven to 350°F. Grease and flour a 9x5-inch loaf pan or line with parchment paper.
02 - Whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl.
03 - In a separate bowl, whisk egg, orange juice, oil (or melted butter), orange zest, and vanilla until uniform.
04 - Pour wet ingredients into dry and gently stir until just combined, avoiding overmixing.
05 - Fold in cranberries and nuts if using, ensuring even distribution.
06 - Pour batter into prepared loaf pan and smooth the surface evenly.
07 - Bake for 50–60 minutes, or until a toothpick inserted in the center comes out clean.
08 - Allow to cool in the pan for 15 minutes; then transfer to a wire rack to cool completely.