Sift flour into a large bowl and add LSA mix. Stir in sugar and make a well in the centre.
In a small bowl, whisk margarine, milk, egg, vanilla and banana together then add to the flour mixture. Stir gently until mixture is just combined.
Spoon mixture into muffin tray and top with 5-6 raspberries (or as desired). Bake for 20-25 minutes or until muffins spring back when touched. Leave in tray for a few minutes before transferring to a wire rack to cool.