In a small bowl combine the flour with the baking powder and mix well to combine.
Combine the apple chunks with the spices in a medium bowl. Mix well and set aside.
In a small saucepan combine butter and sugar. Place the pan on the stove over medium heat and mix until the butter is completely melted. Let cool for 5 minutes and transfer the mixture to a mixing bowl. It should not be hot, just warm.
Add the egg and vanilla extract and whisk very well.
Gradually add the flour mixture and the oats, mixing well after each addition with a rubber spatula.
Gently fold the spiced apples and the white chocolate chips into the batter, distributing them evenly.
Cover the bowl with plastic wrap and refrigerate for 30-60 minutes.
Preheat the Oven to 350°F (180°C) and line a baking sheet with a sheet pf parchment paper.
Using two spoons, drop rounded portions of the dough onto the prepared baking sheet, leaving enough space between each cookie.
Bake at the upper part of the preheated oven for 10-13 minutes or until the edges of the cookies are golden brown. Keep an eye on them to avoid over-baking.
Notes
Store the cooled cookies in airtight containers for up to 3 days at room temperature or up to 5 days in the fridge.