Preheat oven to 350°F. Line a sheet pan with parchment paper.
In a large bowl, combine the peanut butter, sugar, baking soda and egg.
Shape into rounded tablespoons and place on prepared sheet pan. Use the tines of a fork to create a crosshatch pattern.
Bake until puffed and bottoms are golden, about 8-10 minutes. Let cool on the sheet pan 5 minutes, then transfer to a wire rack to cool completely. Store cookies in an airtight container at room temperature for up to several days.
Calories: 157kcal, Carbohydrates: 17g, Protein: 5g, Fat: 9g, Saturated Fat: 2g, Cholesterol: 11mg, Sodium: 156mg, Potassium: 116mg, Fiber: 1g, Sugar: 15g, Vitamin A: 16IU, Calcium: 9mg, Iron: 1mg