Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large bowl, combine the peanut butter, granulated sugar, egg, and baking soda. Mix until the dough is smooth and well combined.
Roll the dough into 1-inch balls and place them about 2 inches apart on the prepared baking sheet.
Bake the cookies for 8-10 minutes, or until the edges are lightly golden.
Remove the cookies from the oven and immediately press one Hershey’s Kiss into the center of each cookie.
Allow the cookies to cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.