Prep the raspberry layer: In a small bowl, lightly mash 1 cup raspberries with 1 to 2 teaspoons sweetener.
If you want a thicker, jammy texture, stir in 1 teaspoon chia seeds and let sit 10 minutes.
Blend the cheesecake base: In a blender or food processor, add 1 cup Greek yogurt, 1 cup cottage cheese or 8 ounces softened reduced-fat cream cheese, 1 scoop vanilla protein powder, 2 to 3 tablespoons powdered sweetener, 1 teaspoon vanilla, 1 to 2 teaspoons lemon juice, a little zest, and a pinch of salt. Blend until silky and smooth, scraping the sides as needed.
Taste and adjust: Check sweetness and tang. Add more sweetener or lemon juice if needed.
If it’s too thick, blend in a splash of unsweetened almond milk.
Optional crust: Mix 1/2 cup almond flour with a pinch of salt, a dash of cinnamon, and 1 tablespoon melted coconut oil or butter. Stir until it looks like damp sand.
Assemble: Spoon 1 to 2 tablespoons crust (if using) into the bottom of each jar and lightly press. Add a layer of raspberry mixture, then a generous layer of cheesecake base.
Repeat if your jars are tall.
Chill: Cover and refrigerate at least 1 hour to set and thicken. The texture improves after 2 to 3 hours.
Finish and serve: Top with a few whole raspberries, a sprinkle of coconut or dark chocolate, and a little lemon zest. Serve cold.