Nut free 'peanut butter' cookies are such a simple idea. Use sesame seed paste (tahini) instead for that nutty flavour. In fact, you can use any nut butter you like and can tolerate.
In a bowl, add the softened butter, tahini and sweetener. Cream together for a few minutes until light and smooth.
Bake at 180C/350F for 10 minutes or until golden.