Preheat oven to 375°F/190°C.
In a small bowl, combine oats, cinnamon, nutmeg, baking powder, salt, and stevia. In a medium bowl, whisk together yogurt, milk, and eggs.
Add dry ingredients to wet ingredients and stir until well combined. Fold in cinnamon chips.
Spray a medium baking dish with cooking spray (I used a 6 x 9-inch dish, but anything similar will work).
Transfer oatmeal mixture to prepared dish and bake for approximately 20-25 minutes, or until top is golden brown and center is just about set. I don't like my baked oatmeal to get too dried out, so I pull it out of the oven when it might still be a little soft in the center. That way, as it cools, it firms slightly but still retains lots of gooey moisture!
Remove from oven, allow to cool for at least 5 minutes, drizzle with maple syrup and additional cinnamon chips, and dig in!