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 the dough is smooth and well combined.
Roll the dough into 1-inch balls and place them 2 inches apart on the prepared baking sheets.
Use a fork to gently flatten each ball, creating a crisscross pattern on top.
Bake the cookies in the preheated oven 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 sheets for 5 minutes before transferring them to a wire rack to cool completely.