Peel and dice 2 medium apples into small cubes. Set aside.
In a saucepan, melt unsalted butter over medium heat and cook until golden brown with a nutty aroma. Add apples and cinnamon (if using) and cook until tender with a slight bite (about 6–10 minutes). Remove from heat and cool.
Preheat oven to 350°F. Line and lightly grease an 8×8-inch square pan with parchment. Mix crust: almond flour, sweetener, and melted unsalted butter. Press firmly into the pan and bake 12–15 minutes until golden. Cool the crust.
Make cheesecake layer: beat cream cheese, egg, vanilla extract, and sweetener until smooth. Divide the mixture in half. Spread one half over the cooled crust.
Make apple layer and bake: fold the cooled apples into the remaining half of the cream cheese mixture. Spread evenly over the cheesecake layer. Bake at 350°F for about 30 minutes, until set with a slight jiggle. Cool completely in the pan.
Chill, slice, serve: refrigerate for 2 hours. Lift out with parchment, cut into 16 squares, and serve.
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Notes
Apples will naturally add sweetness, so taste the filling and adjust sweetener if needed.
Pre-bake the almond flour crust until golden to avoid sogginess.
Chill for at least 2 hours before slicing for neat, clean bars.
Bars can be frozen individually and thawed in the fridge overnight.
For stronger apple flavor, add cinnamon, apple pie spice, or a splash of lemon juice.