In a medium saucepan, combine the sugar and water.
Heat over medium-high heat, whisking often, until the mixture comes to a boil and the sugar has dissolved.
Add the peanut butter and whisk constantly for 1–2 minutes, until smooth and fully combined.
Remove from the heat and allow to cool.
Pour into a clean jar, add a lid, and store in the refrigerator.
Video
Notes
Use smooth peanut butter for the easiest mixing.The syrup may separate slightly as it sits. Stir before using if needed.Use 1–2 tablespoons in coffee, depending on how sweet and peanut-buttery you want your drink.