Preheat the oven to 180°C.
Mix together the flour, baking powder, and salt.
In a separate bowl, combine peanut butter, erythritol, eggs, and milk and mix well.
Combine the dry and wet ingredients to make the batter.
Fill the cupcake molds with the batter.
Bake in the oven at 180°C for 20 minutes.
Once completely cooled, add your desired toppings.