01 - Preheat the oven to 400°F. Line a 12-cup muffin tin with paper liners or lightly grease.
02 - In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until evenly mixed.
03 - In a separate bowl, whisk the eggs, vegetable oil, Greek yogurt (or sour cream), orange juice, orange zest, and vanilla extract until smooth.
04 - Pour wet ingredients into the dry mixture and stir gently just until combined, avoiding overmixing to maintain a tender texture.
05 - Fold in the fresh or frozen cranberries carefully to distribute evenly throughout the batter.
06 - Divide the batter evenly into the prepared muffin cups and sprinkle the tops with coarse sugar if using.
07 - Bake for 18 to 20 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 them to a wire rack to cool completely.