Start with the oats in a large mixing bowl.
Add brown sugar.
Add baking powder, salt, and cinnamon.
Add eggs, milk, and butter.
Combine and mix well. Make sure all oats are moistened.
Pour mixture into a greased metal or glass baking dish. The larger the pan, the thinner the final product. Bake at 350 for 35-40 minutes.
Oatmeal is done when toothpick inserted in center comes out clean.
Slice into equal size parts and enjoy!