Preheat the oven to 200°C.
Mix the flour with the baking powder and cinnamon, then fold in the sugar and lemon zest.
Mix the egg with the cooled butter and buttermilk/almond milk. Add this mixture to the flour, combine gently.
Spoon the batter into silicon muffin baskets or lined muffin tin to half then press 1 or 2 pieces of blackberries in each. Fill the cases with the remaining batter and scatter almond flakes on top and sprinkle 1 pinch of sugar on each.
Bake for about 20-25 minutes in the oven until golden brown.
Transfer the muffins onto a wire rack to cool.