Easy Peanut Butter Cookies

Preheat oven to 350 degrees F. Line a baking sheet with parchment paper. Combine peanut butter, sugar, and egg, vanilla (and chocolate if using). Form dough into round tablespoon-fulls. Then roll in an extra bowl of sugar, if desired. Place on the baking sheet at least 2 inches apart, and flatten slightly with your hand or a spatula. Bake for 7-10 minutes, until the cookies are just slightly browned on the bottom, being careful not to over-bake. Remove and sprinkle with a bit of kosher salt. Let cool on the baking sheet for 1 minute, then transfer to a wire rack to cool completely. They will be soft until they cool. These cookies will stay fresh, kept in an airtight container, at room temperature for up to 1 week. Cookie dough balls can be kept in the fridge for up to 5 days, or frozen for up to 3 months. Bake straight from frozen.