Preheat oven to 400°F.
Using a food processor, mix together dry ingredients.
Then, add cubed butter and pulse just until mixed in to the dry ingredients.
Lastly, add a tablespoon of ice water and pulse; repeat adding ice water this way until dough sticks together.
Roll out dough on a lightly floured surface and press into pie pan. Cover with a sheet of parchment and add pie weights (ceramic, dry beans, rice, etc).
Blind bake crust for 30 minutes. Remove and let cool on the counter.
While the crust is cooling, chop the berries into large chunks.
Next, using a stand mixer with whisk attachment or handheld electric mixer, whisk together all filling ingredients (except the berries) until you get firm peaks.
Fill the pie crust halfway with half of the whipped filling, then top with berries.
Finally, add the rest of the whipped filling on top, and top with berries.
Serve immediately or store in fridge for up to 2 days. Enjoy!