Pre-heat your oven to 375 with a rack in the top third of the oven. Grease a medium baking dish with coconut oil. (8”x8” or 7”x11” work well, but I think this would also work in a 10” ovenproof skillet.) Briefly set aside.
In a mixing bowl, combine the oats, half of the almonds, cinnamon, baking powder and salt.
In a separate bowl, whisk the almond milk, egg, maple syrup, coconut oil, vanilla extract and orange zest.
Arrange half of the sliced oranges in the bottom of the baking dish. Top with the oat mixture. Then pour the milk mixture over the oats. Lightly tap the baking dish on the counter a few times to help distribute the liquid through the oats.
Bake for 20 minutes until the oat mixture is just beginning to set. Top with the remaining almonds and orange slices. Return to the oven and bake for another 20-25 minutes until the oatmeal is set and the top is very lightly browned. (Personally, I like to sprinkle the orange segments with turbinado sugar and pop the oatmeal under the broiler for a minute or two to caramelize the citrus. This is totally optional, but it’s pretty easy, so…why not?)
Serve warm. Feel free to get a little almond milk or a drizzle of maple syrup involved.