Preheat oven to 180 C, line a baking sheet with foil or parchment paper.
In a medium bowl, stir peanut butter and sugar together until smooth. Mix in the eggs, one at a time, then stir in the baking soda and vanilla.
Drop by rounded teaspoons on the baking sheet, placing them 2 inches apart. Use a fork and make a crisscross on the top and press down slightly.
Bake for 10-20 minutes in the preheated oven. Allow cookies to cool on baking sheet for 5 minutes as they will be quite mushy at this point.
Then move to a wire rack to cool completely.
Perfect, and delicious, Peanut Butter Cookies.
Variant used, chocolate chips mixed in.
Variant used, made Blossoms out of several, perfect touch for those that like chocolate.