Prep the strawberries: Rinse and pat dry. Use a paring knife or a strawberry huller to remove the stems and cores, making a small cavity for the filling.
For extra-stable bases, slice a thin sliver off the pointed end so the berries stand upright.
Dry thoroughly: Moisture can thin the filling, so let the berries air-dry on paper towels for at least 10 minutes. Dry berries help the filling cling.
Beat the base: In a medium bowl, beat the softened cream cheese with an electric mixer until smooth and fluffy, about 1 minute.
Add protein and flavor: Mix in the Greek yogurt, sweetener, vanilla, lemon juice, and salt. If using protein powder or collagen, beat it in now. Start with 1/4 cup and adjust to taste and thickness.
Adjust texture: The filling should be thick but pipeable, like standard cheesecake batter.
If it’s too thick, add a teaspoon of milk or almond milk. If too thin, add a bit more protein powder or chill for 10–15 minutes to firm up.
Pipe the filling: Spoon the mixture into a piping bag fitted with a star tip (or a zip-top bag with the corner snipped). Pipe generous swirls into each strawberry cavity.
Add toppings: Sprinkle with your favorite low-carb crunch or color—nuts, crushed freeze-dried berries, a micro-grate of dark chocolate, or cinnamon.
Chill briefly: Refrigerate 20–30 minutes to set the filling slightly. This step helps the flavors meld and the texture firm up.
Serve: Arrange on a platter and enjoy cold.
Keep extras chilled until serving.