Make the strawberry sauce: Add strawberries, syrup, lemon juice, and a pinch of salt to a small pot. Cook over medium heat for 5–7 minutes, stirring as the berries soften and release juices.
If you want it thicker, stir in the cornstarch slurry and simmer 1–2 more minutes. Let cool completely.
Prepare the crust: Crush graham crackers into fine crumbs. Stir in melted butter, maple syrup, cinnamon, and salt.
The mixture should feel like damp sand and hold when pressed. If it’s too dry, add a teaspoon more melted butter.
Whip the cheesecake cream: In a bowl, beat softened cream cheese until smooth. Add Greek yogurt, protein powder, sweetener, vanilla, lemon zest, and salt.
Mix until silky, scraping the bowl so there are no lumps. Adjust sweetness to taste.
Layer the jars: Spoon 2–3 tablespoons of crust into the bottom of each jar and press lightly. Add a thick layer of cheesecake cream.
Spoon strawberry sauce on top. Repeat layers if your jars are tall, finishing with strawberries.
Chill: Cover and refrigerate for at least 1–2 hours so the flavors meld and the layers set. Overnight is even better.
Garnish and serve: Add fresh strawberry slices, a few mint leaves, and a sprinkle of crumbs before serving.