- Preheat the oven to 180C/350F/ Gas Mark 4. 
- Put all your dry ingredients (flour(s), sugar, baking powder, baking soda, cinnamon) into a large bowl and give them a whisk. Alternatively, sieve all the ingredients into the bowl. Set it aside. 
- In a large jug (or another bowl) combine together all your wet ingredients (soya milk, oil and yogurt) and mix them together until incorporated. Set aside. 
- Peel, core and cut your apples into small chunks.  
- Add the chopped apples into the bowl with your dry ingredients and mix until they are well covered in flour mixture.  
- Make a small well in the centre and pour in your wet ingredients. Mix everything in with a spoon or spatula only until incorporated, some lumps are fine. Try not to overmix the batter as it will result in heavier muffins.  
- Divide the batter between 12 muffin cases and bake in the preheated oven for 20-25 minutes or until skewer inserted into cetre of the muffin comes out clean. 
- Take the muffins out of the oven and let them cool in the muffin tin for a few minutes before you take them out onto the cooling rack. Prepare cinnamon sugar topping.