I absolutely adore Apple Crumble. My most favourite is a Chai Spiced Apple Crumble that graces my cookbook. I have tried Apple Crumble Smoothies, Apple Crumble Jaffles and Apple Crumble Panacottas. This time around the Apple Crumble makes a bowl of Bircher Muesli positively delicious with its abundance of texture and subtle spices. Mix, chill and be wowed at breakfast.