01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or lightly grease the cups.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt until evenly mixed.
03 - In a separate bowl, beat eggs thoroughly. Whisk in vegetable oil, buttermilk, orange zest, orange juice, and vanilla extract until well combined.
04 - Pour wet ingredients into dry ingredients. Gently fold with a spatula until just combined, avoiding overmixing to maintain muffin tenderness.
05 - Evenly fold in cranberries, ensuring they are distributed throughout the batter.
06 - Divide batter evenly among prepared muffin cups. Optionally, sprinkle tops with coarse sugar for a crunchy finish.
07 - Bake in preheated oven 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.