Pre-heat the oven at 180°C (356°F).Lightly coat the interior of 8 muffin moulds with coconut oil for easy removal once baked, or line with a paper muffin case/baking paper.Mix all dry ingredients together in a large bowl.In a blender, whiz all wet ingredients till smooth then pour over the dry ingredients, mix with a spatula to combine.Fold through the blueberries (if frozen, thaw first) and lemon zest.Spoon into muffin moulds – right to the very top, then press in three or four small blueberries into each.Bake (force fan) for up to 20 minutes, or until a skewer comes out clean. Once cooked, let sit in the muffin tin for 10-15 minutes before turning out onto a wire rack. Serve once cooled, perhaps with a sprinkle of coconut sugar over the top.