Cream the butter, cream cheese, 4 tablespoon lemon juice and lemon zest together with the powdered erythritol until smooth. Use a food processor or an electric mixer.
Add the egg and mix until well-combined. Last, add the almond flour and mix.
The dough is fairly soft at this stage. Wrap it in cling film and place either in the fridge for 20 - 30 minutes or in the freezer for about 10 minutes.
Pre-heat the oven to 180 Celsius / 356 Fahrenheit.
Line a baking tray with parchment paper. Form 12 cookie dough balls and place them on the tray, flattening them slightly with your hand.
Bake for 15 minutes or until lightly browned at the bottom (and ever so slightly browned on top).
Remove from the oven and let cool completely.
Stir together the lemon juice, powdered erythritol and lemon zest for the glaze and spread over the cooled cookies.
Video
Notes
One cookie weighed on average 30 grams and has 2 g net carbs. The cookies are generous in size and I think one cookie makes a good portion. The cookies are very fragile when hot. They firm up once they cool down. Avoid handling them while they are still warm.