Mix dry ingredients (flour, baking powder, baking soda and salt) in a medium mixing bowl, with a whisk.
In the bowl of your stand mixer, add the softened butter, peanut butter, brown sugar, granulated sugar and vanilla extract. Mix with the paddle attachment until creamy.
Add the egg and mix again until combined.
Add the dry ingredients to the wet ingredients and mix until just combined.
Cover the bowl with cling wrap and refrigerate for 30-40 minutes.
Preheat the oven the 350°F and line a baking sheet with parchment paper.
Take 1 heaping Tablespoon of the refrigerated dough and roll into a ball. Repeat with enough dough to fill the cookie sheet.
Add the 1/2 cup sugar to a small bowl. Roll balls in the sugar and lay back on the baking sheet.
Bake in the oven for 8-9 minutes. While the cookies are baking, unwrap the Hershey Kisses.
Remove from the oven and gently push a Hershey Kiss into the center of each cookie. Bake for another 2 minutes.
Remove cookies from the oven. After the cookies have cooled for 5-10 minutes, transfer to a wire rack to cool completely.