01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup.
02 - In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until evenly distributed.
03 - In a separate bowl, beat the eggs. Add vegetable oil, buttermilk, orange zest, orange juice, and vanilla extract; whisk until well incorporated.
04 - Pour wet ingredients into dry ingredients and gently fold with a spatula until just combined, avoiding overmixing.
05 - Fold cranberries evenly into the batter to ensure uniform distribution.
06 - Spoon batter evenly into prepared muffin cups. Optionally, sprinkle coarse sugar on top for added texture.
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 tin for 5 minutes before transferring to a wire rack to cool completely.