For the crust:

1. Preheat the oven to 350° F.
2. Combine the melted butter, almond flour, sweetener and lemon zest in a medium sized bowl and mix well.
3. Transfer the crust dough to a 9 x 9 pan lined with parchment paper or foil (this will make removing the bars much easier.
4. Press the crust firmly into the bottom of the pan.
5. Bake the crust for 8 minutes.
6. Remove from the oven and set aside to cool.

For the cheesecake filling:

1. Combine the cream cheese, eggs, sweetener and lemon juice in a blender and blend until smooth.
2. Pour over the par baked crust and spread out evenly in the pan.

For the blueberry swirl:

1. Combine the blueberries and sweetener in a small blender cup and blend until mostly smooth.
2. Drop by spoonfuls over the top of the cheesecake mixture.
3. Gently swirl through the circles of blueberry with a knife to distribute, but don’t over mix.
4. Bake the cheesecake bars at 350° F for 25 minutes, or until set.
5. Remove from the oven and cool.
6. Chill for at least 2 hours, preferably longer before cutting into four rows of squares to serve.
7. Store in an airtight container in the refrigerator for up to 5 days, or freeze for up to 3 months.