Slice your stick of butter into small cubes
In your bowl of small cubes of butter add 8 tablespoons of brown sugar
Once you have added your brown sugar add one teaspoon of cinnamon
Add your one cup of oats and one cup of flour in your cinnamon / brown sugar mixture and mix for your oatmeal strudel!
Then you start your mise en place for your pie filling!
Add your sugar In the bowl
Then add your flour
Add one teaspoon of cinnamon
Back to your strudel mixture! Make sure your you whisk away the butter cubes so it is completely incorporated
For your pie filling make sure all your ingredients are incorpated finely
Then add your frozen berries!
Once your pie filling is mixed well it's ready to be poured in your frozen pie crust
Firmly press your oats over the pie filling and put your beautiful pie in the oven temp of 450 degrees and bake for 45 minutes! Enjoy