Grease or line your muffin pans, or use non stick muffin pans.
Clean and peel the apples then grate the apples to make a cup full, and dice some apples in small pieces to make a cup full.
Mix in a large bowl the dry ingredients such as the flour baking powder, baking soda and the cinnamon and salt. Wisk this dry mix up to make it light and fluffy.
Add the grated and chopped apples to the flour mixture (if the apple have liquid in then drain them first.) Mix them in well.
In another bowl add the honey and coconut oil. Mix them up well.
Add the eggs and whisk them in well, and then add the yogurt, apple sauce and vanilla extract. Mix this all up.
Pour the wet ingredients into the dry ingredients and mix up well with a spoon. This makes a thick batter.
Spoon this batter into the grease muffin pans equally and top the muffins with brown sugar.
Bake in the oven for 20-25 minutes until the muffins are golden on top and test done with a clean knife or toothpick.
Leave to cool for 5 minutes on a cooling rack then remove them or tip the muffin pan over and leave them to fall out. Leave to cool on a cooler rack until cool or eat as you please.