01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
03 - In a separate bowl, whisk eggs, vegetable oil, whole milk, vanilla extract, and orange zest until well combined.
04 - Add the wet ingredients to the dry ingredients. Stir gently until just combined; avoid overmixing.
05 - Gently fold in cranberries and nuts if using.
06 - Divide batter evenly among muffin cups, filling each about three-quarters full.
07 - Bake for 18 to 22 minutes or until a toothpick inserted into the center comes out clean.
08 - Allow muffins to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.