In a mixing bowl, combine all the ingredients. Spoon into a greased 9×9 pan. Bake at 350 degrees for 40 to 45 minutes.
If using muffin tins, fill 12 greased muffin tins with the oatmeal. Bake at 350 degrees for 30 minutes.
This recipe doubles easily to make a 9×13 pan or 24 muffins. Remember to grease your pans very well! Old fashioned oats can be used instead of quick cooking oats. It will slightly change the texture but it is still delicious.