Prep the pan: Line the bottom of an 8- or 9-inch springform pan with parchment. Lightly grease the sides so the cheesecake releases cleanly.
Make the crust: In a bowl, mix crushed crackers, melted butter, maple syrup, and a pinch of salt until the texture resembles wet sand. Press firmly and evenly into the pan using the bottom of a glass.
Chill while you make the filling.
Bloom the gelatin: In a small bowl, sprinkle gelatin over 1/4 cup cold water or milk. Let it sit 5 minutes. Then gently warm in the microwave for 10–15 seconds or in a small pot until just dissolved.
Do not boil.
Beat the cream cheese: In a large bowl, beat softened cream cheese with a hand mixer until smooth and lump-free, about 1–2 minutes.
Add yogurt and flavorings: Mix in Greek yogurt, vanilla, lemon juice, and zest. Blend until creamy.
Sweeten and add protein: Whisk in the powdered sweetener and protein powder. Start on low speed, then increase.
Scrape the bowl to avoid dry pockets. Taste and adjust sweetness.
Incorporate gelatin: With the mixer running on low, slowly pour in the warm dissolved gelatin. Mix until fully combined.
The filling should be silky and slightly thick.
Assemble: Pour the filling over the chilled crust. Smooth the top with an offset spatula.
Chill to set: Cover and refrigerate for at least 4 hours, ideally overnight, until firm enough to slice cleanly.
Finish and serve: Run a thin knife around the edge, release the springform, and transfer to a serving plate. Add berries, a little jam, or chocolate shavings.
Slice with a warm, dry knife for neat edges.