Preheat your oven to 325°F and lightly grease an 8x8 inch glass or ceramic baking dish.
In a blender, combine the cottage cheese, eggs, almond flour, protein powder, sweetener, lemon zest, baking powder, vanilla extract, and salt. Blend until completely smooth.
Pour the smooth batter into the prepared baking dish. Scatter the fresh berries evenly over the top.
Bake for 25 to 30 minutes, until the edges look set and the top feels just slightly firm to the touch. Be careful not to over-bake.
Remove from the oven and let it cool for about 10 minutes. The top will sink a bit as it cools, creating a custard-like texture.
Slice into 6 servings and sprinkle with powdered sweetener or drizzle with keto maple syrup if you like.
Notes
Nutrition Information (per serving): Calories: 183, Total Carbs: 7.2g, Net Carbs: 5.1g, Fats: 10.7g, Protein: 18.4g.