Preheat your oven to 180.c /350f
In a large bowl whisk together the mashed banana, melted butter, egg, milk, vanilla and honey.
Add in the flour, baking powder and blueberries and gently fold altogether. Do not over mix or your muffin will be tough.
Spoon into prepared muffin tins and bake for 20 minutes
Makes 12 muffins