Preheat the oven to 375°F and prepare an 8”x8” baking dish by greasing it with cooking spray, butter or coconut oil, or lining it with parchment paper.
In a large bowl, mix together the milk, Greek yogurt, eggs and vanilla extract. Set this aside while you prepare the dry ingredients.
In a medium-sized bowl, mix together the oats, brown sugar, baking powder, cinnamon and salt. Add this to the wet ingredients and stir until just combined. Fold in the halved blackberries and chopped walnuts.
Pour the batter into the prepared baking dish and use a spatula to spread it out evenly.
Bake for 30-40 minutes or until an inserted toothpick comes out clean. Allow it to cool for 10 minutes before cutting into it, serving and topping with your desired ingredients. Enjoy!
Notes
Substitutions
Quick oats
Feel free to use these instead of old fashioned rolled oats.
Flavoured Greek yogurt
If you prefer to use a flavoured Greek yogurt instead of plain, I recommend vanilla or a berry flavour.
Alternative milks
If you follow a plant-based diet or just prefer alternative milks, you can also use oat or almond milk in this recipe instead.
Other types of brown sugar
Any kind of brown sugar will work in this recipe.
Pecans
Feel free to use chopped pecans instead of walnuts, if you prefer.
Protein powder
If you want to boost the protein content even more, you can add ¼ cup of plain or vanilla protein powder into the dry ingredient mixture.
Dietary considerations
This recipe is naturally vegetarian.
Gluten free: use certified gluten-free oats.
Lactose free: use lactose-free yogurt and milk.
Dairy free: opt for dairy-free yogurt and milk (like soy or almond).
Vegan: opt for a vegan yogurt (ex. Coconut- or soy-based), a plant-based milk (like soy or almond) and a flax egg.