Preheat the oven to 180°C.
Place 18 muffin cases in 2 muffin trays.
In a large bowl add the flour, sugar, baking powder, bicarbonate of soda and salt, mix well.
In smaller bowl, whisk the egg, oil, yogurt and vanilla paste.
Stir this into the dry ingredients until just moistened.
Fold in the bananas, blueberries and white chocolate.
Fill muffin cases two thirds full.
Bake for 22 – 25 minutes or until a cocktail stick inserted in middle comes out clean.
Cool for 5 minutes, then put on a wire rack to cool fully.