Preheat the oven to 200°C (fan) / 400°F / Gas Mark 6. Line a 12-hole muffin tin with paper cases.
Melt the dairy-free butter in a microwave or small saucepan and set aside to cool.
Peel and mash the bananas. Tip into a food mixer with the yoghurt and melted butter and the sugars. Beat until smooth.
Sift the plan and wholemeal flour, cinnamon, bicarbonate of soda and baking powder into the bowl, and fold in gently. Finally, stir the raisins through the mixture.
Divide the mixture between 12 muffin cases, (I find an ice cream scoop the easiest and least messy way to do this!).
Bake for 20-25 minutes until an inserted knife or skewer comes out clean.