01 - Preheat oven to 350°F. Grease and flour a 9x5-inch loaf pan or line it with parchment paper.
02 - In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until evenly distributed.
03 - In a separate bowl, lightly beat the eggs. Add the milk, vegetable oil, orange zest, orange juice, and vanilla extract, then mix until smooth.
04 - Pour the wet mixture into the dry ingredients and stir just until combined. Do not overmix to keep the bread tender.
05 - Gently fold the cranberries and nuts (if using) into the batter with a spatula, distributing evenly without crushing the berries.
06 - Transfer the batter into the prepared loaf pan and smooth the top with a spatula for an even surface.
07 - Bake for 45–55 minutes, or until a toothpick inserted into the center comes out clean. A few moist crumbs are acceptable.
08 - Let the bread cool in the pan for 15 minutes, then transfer to a wire rack to cool completely before slicing.