Preheat oven to 325F and line a small baking sheet with parchment or a silicone mat.
In a small bowl, beat the peanut butter, butter, and sweetener until well combined. Beat in the egg white and vanilla extract.
Add the peanut flour, baking powder, and salt and mix until dough comes together. Divide dough in half and roll into balls.
Press each ball into a flat disc, about 1/2 inch thick. Top each with 1 tsp of chocolate chips, pressing into the dough to adhere.
Bake 10 to 12 minutes. The cookies will still be very soft but will firm up as they cool.
Notes
Serves 2. Each cookie has 3.84g NET CARBS.Food energy: 163kcal Total fat: 13.22g Calories from fat: 119 Cholesterol: 15mg Carbohydrate: 5.70g Total dietary fiber: 1.86g Protein: 4.88g Erythritol: 16g