Pre-heat oven to 200C / Fan 180C
Line muffin trays with paper cases.
Sieve flour into a large bowl, add the bicarbonate of soda then stir in the porridge oats, sugar and chopped cranberries.
In a separate pyrex bowl, first mash up the bananas then mix in the egg, vegetable oil and yogurt.
Using a spatula, fold these wet ingredients carefully into the dry ingredients you don’t want to make the mixture too dense.
Divide the mixture equally between the paper cases, filling to the top of each case.
Bake in the centre of the oven for approximately 15 – 18 minutes. Insert a wooden skewer (which should come out clean) to check they are cooked.
Allow to cool a little in the muffin tray before removing and allowing to cool completely on a wire rack.
Once cooled completely, store in an air tight sealed container for three to five days.