Preheat the oven to 180°C/350°F/Gas Mark 4.
Line a muffin tin with 8 paper muffin cases.
In a large bowl, combine the muesli with the sugar, flour, baking powder, cinnamon, salt, and blueberries (don’t squish them – keep them whole)
Thoroughly mix the plant milk, apple, oil, nut butter, and raisins/sultanas in a jug.
Stir this liquid and mix it into the dry ingredients with a wooden spoon.
Once combined, divide the mixture equally between the muffin cases until about three-quarters full. Sprinkle over the sunflower seeds if using/
Bake for 25-30 minutes or until the muffins are risen and golden.