Heat the oven to 180°C/160°C fan/gas 4. In a medium mixing bowl, combine the flour with the oats, baking powder, bicarb and raisins.
In a separate medium mixing bowl, combine the eggs, oil, yogurt, mashed bananas and honey. Pour this into the flour mixture, then fold together using a wooden spoon. Don’t overmix or the muffins will become dense when baked.
Divide the mixture equally among the muffin cases in the tray, then sprinkle the extra oats over the tops. Bake for 25-30 minutes until the muffins are golden and feel springy to touch, and a skewer pushed inside comes out clean.