Preheat oven to 350°. Grease or spray baking sheets. Mix peanut butter and sugar with mixer until well combined. Beat egg into peanut butter mixture and then add baking soda.With level teaspoons of dough, roll and place about 1 inch apart on baking sheets. Flatten with fork so they are about 1-1/2 inches in diameter. Bake cookies in the middle of the oven until puffed and pale golden brown,approximately 10 minutes. Cool on baking sheets for 2 minutes and tranfer to cooling racks with metal spatula. After cooled thoroughly store in air tight container at room temperature up to 5 days. Approximately 2 dozen cookies. This recipe does not contain any flour!! Thanks to Sue.