Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, mix the creamy peanut butter, granulated sugar, and brown sugar together until well combined and smooth.
Add in the egg and vanilla extract, mixing until fully incorporated.
In a separate bowl, whisk together the baking soda, salt, and flour. Gradually add this dry mixture to the peanut butter mixture, stirring until a dough forms.
Shape the dough into 1-inch balls and roll them in granulated sugar until evenly coated.
Place the sugar-coated balls onto the prepared baking sheet, spaced about 2 inches apart.
Bake in the preheated oven for 10-12 minutes, until the tops are lightly crackled but not overcooked.
Remove the baking sheet from the oven and immediately press a Hershey's Kiss into the center of each cookie, allowing the chocolate to melt slightly.
Transfer the cookies to a wire rack to cool completely.
Notes
Arrange the cookies on a decorative platter and sprinkle some additional granulated sugar around them for an elegant touch.