The peanut butter I use is just peanuts and sea salt. If your peanut butter does not have any salt in it, bump up the salt by a bit (a pinch or two). The peanut butter should be stirrable with a spoon. Most natural peanut butter separates some and you must stir it to combine the oil and peanut butter before using. Do not use a thick, peanut butter like Jif. It will not easily stir into the mixture and will affect the overall flavor and texture.