Preheat the oven to 350°F / 175°C. Line a baking sheet with parchment paper or a silicone baking mat.
In a small saucepan set over medium heat, brown the butter. Stir the butter occasionally until it turns amber in color and develops little brown specks.
Add the peanut butter to a small mixing bowl, then pour the hot brown butter over the peanut butter. Mix until the peanut butter has melted and the mixture is cohesive, then set the bowl in the freezer to chill for 5 minutes.
Add in the brown sugar, egg yolk, milk and vanilla. Whisk until well combined.
Add in the flour, baking soda, baking powder and salt. Fold the mixture together just until no more flour streaks remain.
Make the sugar coating by mixing the sugar and nutmeg together in a small bowl.
Use a 1.5 tbsp. cookie scoop to dish out the dough, then roll each cookie in the nutmeg sugar.
Evenly space out the coated scoops of the cookie dough on the cookie sheet and bake for 8 minutes. While the cookies are baking, unwrap 10 hershey's kisses so that they are ready when the cookies come out of the oven.
IMMEDIATELY after the cookies come out of the oven, press a kiss into the center of each one. Once all the cookies have a kiss, place them in the fridge to chill for 10-15 minutes or until the cookies are no longer warm. Enjoy!