Preheat oven to 375°F and prepare an 8x8 baking dish. Grease with olive oil.
In a large mixing bowl combine, rolled oats, baking powder, salt, cinnamon, pumpkin pie spice, brown sugar and ground flax seeds.
Into the bowl of dry ingredients, add your milk of choice and stir until incorporated evenly.
Next, add the olive oil and applesauce. Stir until all ingredients are mixed well.
Lastly, gently fold in the diced apple and ½ cup of chopped walnuts until swirled throughout.
Pour the mixture into the prepared baking dish and smooth over, add an additional quarter cup of roughly chopped walnuts to the top and pat in gently, bake for 45 minutes or until a light golden brown.
Allow to cool and set for 5-10 minutes, enjoy warm!