Grease or butter a 9×13 baking dish; set aside.
Lightly beat the eggs in a mixing bowl, and then add the remaining ingredients except the oats. Mix well. Add the oats, and stir to fully incorporate.
Transfer the mixture to the prepared baking dish. Allow the oatmeal to rest on the counter for at least and hour or up to two hours. This will give the oats time to plump up. Beyond 2 hours, cover and refrigerate up to overnight.
When ready to bake, uncover the oatmeal and preheat the oven to 375 degrees F. If the oatmeal has been refrigerated, allow the baking dish to sit on the counter while the oven preheats. Bake for 25-30 minutes or until just firm in the center.
May serve with warmed milk, additional nuts, raisins, coconut, and/or chopped bananas. It is delicious eaten like a muffin, too.
Cover and store leftovers in the refrigerator. Reheat gently in the microwave or enjoy cold.