Preheat the oven to 375°F (190°C) and line baking sheets with parchment paper.

In a mixing bowl, combine softened butter, granulated sugar, light brown sugar, and peanut butter. Beat until light and fluffy.

Add the egg and vanilla extract, mixing on low speed until blended.

In another bowl, whisk together flour, baking soda, and salt. Gradually add to wet mixture, mixing until incorporated.

Scoop rounded tablespoons of dough, roll into balls, then roll in granulated sugar. Place on baking sheets.

Bake for 10-12 minutes until lightly golden and puffed. Press a Hershey's Kiss into the center of each cookie immediately after removing from oven.

Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.