Raspberry and Blackberry Spelt Cupcakes (with Berry Cream Cheese Frosting)

Name: Raspberry and Blackberry Spelt Cupcakes (with Berry Cream Cheese Frosting)
Prep time: 20 min
Cook time: 18 min
Total time: 38 min
Cuisine: American
Ingredients: 120g (4¼ oz) fresh berries (see note 1); 75g (¼ cup + 1 tbsp) butter (softened); 75g (¼ cup + 2 tbsp) sugar; 1 egg (medium); 1 tsp vanilla; 100g (⅚ cup) spelt flour (see note 2); 1 tsp baking powder; ¼ tsp baking soda; 1 tbsp lemon juice; 100g (¼ cup + 3 tbsp) cream cheese; 30g (2 tbs) butter (softened); 2 tbs berry sauce; icing / powdered /confectioners' sugar (see note 3)