Preheat oven to 350 degrees F. Spray a 9x9-inch baking dish with nonstick cooking spray; set aside.
In a large mixing bowl, combine berries, 2 Tablespoons sweetener, cornstarch, lemon juice and vanilla extract then spread evenly into prepared pan.
In a separate bowl, combine Kodiak Cakes, oats, protein powder, 1/2 cup sweetener, cinnamon, eggs and milk until just combined. Crumble mixture on top of berries.
Bake for 18-20 minutes or until golden brown on top. Remove from oven and let cool for 5 minutes before serving.