Grease an 8x8 or 9x5 inch baking dish* and set aside.
In a mixing bowl, mix together the dry ingredients, from the rolled oats to the raisins.
Add in the sweetener, non-dairy milk and shredded carrot. Stir until well combined.
Pour the batter into your prepared baking dish and smooth out the batter until even and uniform.
Place the baking dish in the fridge overnight** or for a few hours.
In the morning, removed the baking dish from the oven and preheat the oven to 350 °F.
Bake the oatmeal for about 25-35 minutes, depending on what size pan you use. For an 8x8, 25 minutes will be about right. If you use a loaf pan like I mention in the notes, then it will need 30-35 minutes.
Serve warm with your favorite toppings!
Notes
I've made this oatmeal in a pan as big as 8x8 or as small as a loaf pan. Both worked great, but the smaller pan will need more time to bake and result in a moister, thicker baked oatmeal.
You can leave the oatmeal uncovered or covered while it sit in the fridge overnight. I never cover mine and it's fine!