Preheat oven to 375°Spray a 9x13 rectangular pan with cooking spray so the oatmeal wont stick.
Mix all wet ingredients: Combine milk, maple syrup, eggs, butter, and vanilla extract.
Mix all Dry ingredients: In the same bowl as the wet ingredients, combine oats,nutmeg,cinnamon,salt, and baking powder, and raisins.
Pour ingredients into prepared pan and place in the center of the oven for 35-40 minutes.
Once done, let cool for 5 minutes and serve warm. Enjoy!