Preheat oven to 375°F. In a mixing bowl, combine apples, apple cider vinegar and cinnamon powder. Toss well to combine.
Combine brown sugar, cinnamon, butter, vanilla extract, coconut oil and oatmeal in a bowl
Layer the sliced apples in the greased baking pan. And sprinkle the oats - sugar mixture over the apples
Bake for 43- 45 minutes or until topping looks crunchy and apples are tender.