Preheat oven to 180C (350F).

In a bowl, stir together peanut butter, sugar and baking powder.

Stir in egg to form a wet dough.

Form into balls using heaped teaspoons and place on 2 trays lined with baking paper, allowing room to spread. Press on cookies to flatten slightly and sprinkle with a little sea salt.

Bake for 8-10 minutes or until cookies are golden at the edges. Cool on the tray.