Beat the sugar and egg together until smooth.
Beat in vanilla.
Add peanut butter and beat until you have a soft dough.
Using a large cookie scoop, scoop dough into 6 balls. For smaller cookies, use a medium scoop. If you don't have a scoop, just make balls.
Put the balls on a plate line with plastic wrap, then cover and freeze for about 30 minutes or until you are ready to bake the cookies.
Preheat oven to 350 degrees F (176 C). Line a couple of cookie sheets with parchment paper or leave ungreased/un-lined.
Put the frozen cookie dough balls on a baking sheet. Sprinkle with a bit of sea salt and bake for 20 to 22 minutes (check at 16 if making small cookies).
Let cool on baking sheet for a few minutes, then transfer to a wire rack and let cool completely.
