Combine oats, baking powder, cinnamon, dark brown sugar and chopped nuts in a large bowl and mix. Beat eggs in a medium bowl and then add milk, vanilla, vegetable oil and apple sauce.
Add dry ingredients to milk mixture and stir well.
Grease a 20cm dish. Pour oat mixture into dish and bake in the oven for 35-40 minutes at 175C or until toothpick inserted into the center comes out clean.