Skillet Blackberry Apple Macadamia Oat Crunch

Name: Skillet Blackberry Apple Macadamia Oat Crunch
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: Thai, Asian
Ingredients: 2 tbsp butter; 2 medium-sized apples (chopped into pieces); 2 tbsp brown sugar; 1 tsp cinnamon; blackberries (a handful); 100g (¼ cup + 3 tbsp) butter (melted); 100g (3½ oz) oats; 75g (2¾ oz) salted macadamias (chopped); 60g (½ cup) spelt flour (see note 1); 100g (½ cup) brown sugar