Preheat your oven to 375°F and line your baking sheets with parchment paper.
In a large bowl or a stand mixer with the paddle attachment, mix together peanut butter, butter, both sugars, and salt. Beat on medium speed until smooth and creamy. Add in the egg and vanilla extract, and mix until fully combined. Scrape the sides of the bowl.
¾ cup creamy peanut butter, ½ cup unsalted butter, ½ cup granulated sugar plus, ¼ teaspoon salt, 1 large egg, 1 teaspoon vanilla extract, ½ cup packed light brown sugar
Add the flour and baking soda, then beat on low speed just until the dough comes together.
½ teaspoon baking soda, 1½ cups all-purpose flour
Scoop the dough into 1-inch portions (about 1 tablespoon each) and roll them in extra sugar if you like. Arrange the dough balls on the prepared sheets, leaving about 2 inches of space between each one.
½ cup granulated sugar plus
Bake for 8 to 10 minutes, or until the cookies appear puffed and cracked with lightly browned bottoms. Press a chocolate kiss into the middle of each cookie right after baking (the cracks are normal!).
36 Hershey’s dark chocolate kisses
Allow the cookies to cool on the sheet until the chocolate hardens. Enjoy or store in an airtight container for up to a week.