Preheat your oven to 350°F (175°C) and line a 9x9 baking pan with parchment paper for easy removal.
Combine almond flour, melted butter, powdered erythritol, and vanilla extract in a mixing bowl. Mix until crumbly.
Press the mixture evenly into the lined pan to form the crust.
Bake for 10 minutes or until lightly golden, then let cool.
In a saucepan, cook cherries, powdered erythritol, and lemon juice over medium heat for about 5 minutes, stirring occasionally, until the cherries release their juices.
Stir in xanthan gum and cook for another 2-3 minutes until the mixture thickens. Let cool.
In a mixing bowl, combine almond flour, powdered erythritol, and chilled cubed butter. Mix with fingers or a fork until it forms coarse crumbs.
Spread the cooled cherry filling evenly over the crust.
Sprinkle the crumble topping evenly over the cherry layer.
Bake for 20-25 minutes or until the topping is golden and crisp.
Let the bars cool completely in the pan before slicing and serving. Enjoy!