Preheat the oven to 350°F (175°C). Line two baking sheets with parchment paper.
In a large bowl, combine the peanut butter, granulated sugar, egg, and baking soda. Mix until smooth and well combined.
Roll the dough into 24 equal-sized balls, about 1 inch in diameter, and place them 2 inches apart on the prepared baking sheets.
Use a fork to gently press down on each ball twice, creating a crisscross pattern.
Bake the cookies for 8 to 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 before transferring them to a wire rack to cool completely.