Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper to prevent sticking.
In a large mixing bowl, combine the creamy peanut butter, granulated sugar, and packed brown sugar. Using a spatula or hand mixer, blend until the mixture is smooth and well incorporated.
Crack the egg into the bowl and pour in the vanilla extract. Mix again until the egg is fully integrated into the peanut butter blend.
In a separate medium bowl, whisk together the baking soda, sea salt, and all-purpose flour until evenly combined. Gradually add this dry mixture to the peanut butter mixture, stirring gently until a dough forms. It should be soft but not sticky.
Using your hands, shape the dough into 1-inch balls. Roll each ball in a small bowl of granulated sugar, ensuring they are evenly coated.
Place the sugar-coated dough balls on the prepared baking sheet, leaving about 2 inches between each cookie to allow for spreading.
Bake in the preheated oven for 10-12 minutes, or until the tops of the cookies are lightly crackled and the edges appear set but still soft in the center.
Once baked, remove the baking sheet from the oven. Immediately press a Hershey's Kiss into the center of each cookie, allowing the chocolate to slightly melt and sink into the cookie.
Carefully transfer the cookies to a wire rack using a spatula and let them cool completely.
Notes
Arrange the cookies on a decorative platter and sprinkle some additional granulated sugar around them for an elegant touch.