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Oatmeal Breakfast Casserole

Author : Ashley Madden
Prep Time: 20 mins
Cook Time: 1 hr 10 mins
Total Time: 1 hr 30 mins
Servings: 8
Course: Breakfast
5 from 3 votes
This oatmeal breakfast casserole is about to upgrade brunch! You can make it right before baking or even the night before (see notes for the overnight version!).


  • Casserole or Baking Dish


  • 3 cups diced apple your favourite variety, about 2 large or 3 small apples
  • 2 tablespoons ground flaxseed
  • ¼ cup water
  • 3 cups old fashioned rolled oats - not instant or steel cut (gluten-free if needed)
  • 1 cup chopped walnuts or pecans
  • ½ cup raisins or sultanas
  • 2 teaspoons baking powder
  • 2 teaspoons cinnamon
  • ¼ teaspoon ground nutmeg
  • 3 tablespoons chia seeds
  • 3 tablespoons hemp seeds , optional
  • ¼ teaspoon sea salt
  • cups unsweetened almond milk
  • ½ cup maple syrup
  • 1 tablespoon vanilla extract
  • 2 tablespoons coconut sugar (optional)


  • Preheat the oven to 350°F.
  • Chop the apples and transfer to a large bowl of water with a squeeze of lemon (this prevents browning).
  • In a small bowl, mix together the ground flaxseed and water. Set aside for 5 minutes to thicken.
  • In a large bowl, mix the rolled oats, nuts, raisins, baking powder, cinnamon, nutmeg, chia seeds, hemp seeds, and salt.
  • In a separate bowl or glass measuring cup, mix together the almond milk, maple syrup, and vanilla. Add the thickened flax mixture.
  • Add the wet ingredients to the dry ingredients and mix well using a spatula.
  • Drain the apples well in a colander and stir into the oat mix. The mixture will seem loose – this is ok.
  • Transfer the mix to an 9x9 inch casserole dish (or similar size). Cover with tinfoil and bake for 50 minutes.
  • After 50 minutes remove the tinfoil, sprinkle the coconut sugar (if using) on top and continue to bake for another 20 minutes.
  • Remove from the oven and let sit for at least 10 minutes. Slice or spoon out and serve! Top with Almond Caramel from The Plant-Based Cookbook, nut butters, maple syrup, additional nuts and/or fresh berries.


If you want a firmer final product (I like mine with some ooey gooey-ness), reduce the almond milk to 3 cups.
To make this dish into a dessert, serve warm with your favourite ice cream (coconut, soy or almond ice creams will work nicely).
This freezes well too. Wait for it to cool, separate it into individual portions, and then place in a freezer-safe baggie or container.
  1. Make the oatmeal breakfast casserole as is written except don't prepare or add the apples. You'll do this right before it goes in the oven. Cover the casserole with tinfoil and place it in the fridge overnight. You could also use fresh berries instead of apples and if you do, you can add those in the night before. 
  2. In the morning remove the casserole from the fridge and take off the tinfoil. Preheat the oven to 350ºF. Chop the apples and fold them into the casserole. Bake the casserole uncovered for 50 minutes.
  3. Remove from the oven and let cool for 10 minutes before serving. 
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