Preheat the oven to 350°F (175°C). Line two baking sheets with parchment paper.
In a large mixing bowl, combine 1 cup creamy peanut butter, 1 cup granulated sugar, 1 large egg, and 1 teaspoon baking soda. Mix until smooth and well combined.
Roll the dough into 24 equal-sized balls, about 1 inch in diameter, and place them on the prepared baking sheets about 2 inches apart.
Use a fork to gently press down each ball twice, creating a crisscross pattern on the top of each cookie.
Bake the cookies in the preheated oven for 10 minutes.
Remove the cookies from the oven and immediately press one unwrapped Hershey’s Kiss into the center of each cookie.
Return the baking sheets to the oven and bake for an additional 2 minutes to slightly soften the cookie around the Kiss.
Remove from the oven and allow the cookies to cool on the baking sheets for 5 minutes before transferring them to a wire rack to cool completely.