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.
03 - In a separate bowl, beat the eggs, then whisk in vegetable oil, buttermilk, orange zest, fresh orange juice, and vanilla extract until smooth.
04 - Pour wet mixture into dry ingredients and gently fold with a spatula just until combined, avoiding overmixing.
05 - Fold cranberries evenly into the batter.
06 - Divide batter evenly among muffin cups and optionally sprinkle tops with coarse sugar.
07 - Bake for 18 to 22 minutes or until a toothpick inserted in the center comes out clean.
08 - Let muffins cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.