- Line your air fryer basket, with with parchment paper. 
- Whisk together the flour, baking soda, salt, and cocoa. Set aside. 
- Beat the butter and medium speed for 5 minutes. Scrape down the sides. Add the sugar and continue beating for 5 to 7 minutes or until fluffy. 
- Add the egg, vanilla extract and food coloring, beating until evenly combined. Fold in the flour mixture and beat until mixed. 
- Slowly add the milk to the dough as the mixer runs, adding just enough to soften the dough. 
- Using a small (1 tablespoon) cookie scoop, portion the cookie dough and shape it into balls. Place on the parchment paper about 1 inch apart. 
- Set the tray into the air fryer and set the temperature to 320 degrees F, air fryer set, set the time for 8 to 10 minutes or until the cookies are puffed, and the edges are set. Cool the cookies on the baking sheet for 2 to 3 minutes before pressing one kiss into the center of each cookie. 
- Transfer to a wire rack and allow the cookies to cool completely. The candies will look like they are melting but do not disturb them, and they will resolidify in the correct shape. 
- Plate, serve, and enjoy!