Preheat oven to 200 degree C.
Take flour, baking powder, salt and walnuts in a bowl and mix well. Set aside.
Take eggs, sugar, milk, oil, vanilla and cinnamon in a bowl and whisk well.
Add flour and apples and fold gently.
Spoon it into the baking cups and bake for 20 to 25 mins.
Remove and serve warm.