Coat the cranberries with some flour.
Line a muffin tray with cake cups.
Preheat the oven to 180°C.
Sift together flour, salt, baking powder and baking soda into a bowl.
Add orange zest, chocolate chips and mix well.
Add yogurt, oil and sugar into another mixing bowl.
Whisk till its a bit frothy.
Add the flour mixture and mix gently just enough to coat the flour with the liquid.
Add the cranberries and gently fold them in.
Don't over mix the batter.
Spoon the batter into the prepared cups.
Bake them in the oven till the tops are golden brown and done. Insert a toothpick in the middle of the muffin. It should come out clean if the muffins are done.
Big muffins take about 20-25 minutes and the medium ones take about 15-20 minutes.
Let the muffins cool on a wire rack.