Healthy apple and raisin muffins

Ingredients

• 1 very ripe medium banana ((about 100g peeled weight))
• 225 ml semi-skimmed milk
• 3 tbsp sunflower oil
• 2 large eggs, (beaten)
• 2 small eating apples
• 275 g self-raising flour
• 1 tsp ground mixed spice
• 3 tbsp soft light brown sugar
• 1 tsp bicarbonate of soda
• 40 g raisins or sultanas