Blackberry Skillet Overnight Buns (Bread Machine)

Name: Blackberry Skillet Overnight Buns (Bread Machine)
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: American, World Cuisine
Ingredients: 200g (7 oz) blackberries (fresh or frozen); 1 tsp vanilla extract; 2 tbs sugar; 250ml (1 cup) milk; 1 egg (medium); 50g (3½ tbs) butter (chopped into small pieces); 1 tbs olive oil; 400-450g (3⅓ - 3¾ cups) spelt flour (see note 2); 4 tbs sugar; 7g (2¼ tsp) dried yeast (see note 3); pinch salt; icing sugar (as much as needed); 1 tbs water