Preheat your oven to 170°C (340°F) so it’s fully heated by the time your batter is ready, and lightly grease a baking dish with a small amount of oil or butter to prevent sticking and ensure clean slices later.
In a large mixing bowl, add the softened cream cheese and Greek yogurt. Mix them together slowly until the texture becomes completely smooth and creamy with no lumps remaining. Take your time here—this step is key for achieving that classic cheesecake consistency.
Add the eggs one at a time, mixing gently after each addition until just combined. Avoid overmixing, as too much air can affect the final texture and cause cracks while baking.
Add the sweetener, protein powder, vanilla extract, and a pinch of salt to the mixture. Stir gently until everything is fully incorporated into a smooth, thick batter. If the mixture feels too thick, you can add a tablespoon of milk to loosen it slightly.
Carefully fold in the berries using a spatula, distributing them evenly throughout the batter. Be gentle during this step so the berries don’t break apart too much or bleed excessive color into the mixture.
Pour the prepared batter into the greased baking dish and spread it out evenly using a spatula, making sure the surface is smooth for even baking.
Place the dish in the preheated oven and bake for 30–35 minutes. The edges should be set and slightly firm, while the center should still have a slight jiggle—this ensures a soft, creamy texture once cooled.
Remove the cheesecake from the oven and let it cool at room temperature for about 15–20 minutes. This gradual cooling helps prevent cracks and allows the structure to set properly.
Once slightly cooled, transfer the dish to the refrigerator and let it chill for at least 2 hours (or longer if possible). This step is essential for achieving the best texture—firm, sliceable, and creamy.
After chilling, slice into portions using a sharp knife (wipe the blade between cuts for cleaner slices) and serve cold for the most satisfying flavor and texture.