Prep the jars: Clean and dry 4–6 jars.
Set aside.
Make the crust: In a small bowl, mix almond flour, melted butter, sweetener, cinnamon, and salt until sandy. Spoon 1–2 tablespoons into each jar and press lightly with the back of a spoon. Set aside.
For a firmer base, chill 10 minutes.
Soften the cream cheese: In a medium bowl, beat the cream cheese with a hand mixer until smooth and fluffy, 1–2 minutes. This prevents lumps later.
Add the yogurt and sweetener: Beat in Greek yogurt and powdered sweetener until silky. Scrape the bowl.
Flavor and protein: Add mashed banana, banana extract, vanilla, and a pinch of salt.
Mix until smooth. Sprinkle in the protein powder and blend on low until incorporated. If the mixture seems too thick, add almond milk 1 tablespoon at a time.
Taste and adjust: Check sweetness and banana flavor.
Add a touch more extract or sweetener if you want a stronger dessert vibe.
Assemble: Spoon the cheesecake filling over the crusts, dividing evenly. Tap jars gently on the counter to level.
Chill: Cover and refrigerate at least 2 hours, or up to overnight, for the best set and flavor.
Finish and serve: Top with a small dollop of whipped topping, a few banana slices, almonds or coconut, and a light dusting of cinnamon. Serve cold.