Preheat the oven to 180°C (356°F).
Combine almond butter, peanut butter, sweetener, and egg in a bowl and mix well.
Divide the dough into 20g portions and shape into balls.
Place the dough balls onto a baking pan.
Press the tops of the cookies gently with a fork to create a pattern.
Bake in the oven at 180°C for 12–15 minutes.
Transfer to a cooling rack and let them cool completely.