In a large mixing bowl, mix the butter, peanut, and sugar for about 2 minutes. Then slowly add in the egg, milk, vanilla extract, and food coloring, mix again for another 2 minutes, until light and fluffy.
In another mixing bowl, mix the cocoa, flour, baking soda, and salt.
Add the two mixtures together and mix well. Mix until fluffy.
Add a piece of parchment paper to the basket. In a small bowl, add your sanding sugar, roll the dough into 2-inch pieces, and coat the balls with the sanding sugar. Set the temperature to 320 degrees F, air fryer setting for 5-6 minutes.
When the cookies are done, wait about 10 minutes, and then put a candy kiss in the cookie's center.
Plate, serve, and enjoy!