Wash and dice your apples into nice bite sized chunks.
In a medium bowl, combine oats, brown sugar, baking powder, and salt. Mix until combined.
In a separate small bowl, whisk your milk & eggs with the oil, cinnamon and vanilla.
Add your apples and egg mixture to the bowl with the oats. Then stir to combine everything. Let this sit for about an hour so the all the oatmeal can really oak up the liquid.
Pour this into a greased 8 x8 pan (or use parchment paper). Bake in 350 degree oven for 30 minutes.
Once cooled, cut into 16 bars and store in an airtight container.