Preheat the oven to 350 degrees F and grease an 8” x 8” or 9” x 9” baking dish.
Add the oats, sugar, baking powder, cinnamon and sea salt to a mixing bowl.
In a separate mixing bowl, whisk together the non-dairy milk, and eggs until well combined.
Pour the wet mixture into the bowl with the dry mixture and stir well. Note: if making the baked oatmeal ahead of time, cover the mixing bowl and refrigerate until ready to bake.
Stir in any additional ingredients, such as berries, dried fruit, sliced bananas, nut butter, chocolate chips, etc (you can either stir these ingredients into the mixture or use them as toppings).
Transfer the baked oatmeal mixture to the prepared baking pan. Top with any desired ingredients (I do ½ cup fresh blueberries and about ¼ cup unsweetened shredded coconut) and bake 40 to 55 minutes, until baked oatmeal is golden-brown around the edges and set up in the center.