Preheat oven to 350° F.

Drain maraschino cherries, reserving the juice.

In a small bowl, whisk together flour and cocoa. Set aside.

In a large bowl, beat butter with an electric mixer on medium to high speed for about 30 seconds, or until softened. Add sugar, salt, baking powder, and baking soda. Beat until well combined. Add egg and vanilla. Beat well. Gradually beat in the flour mixture.

Shape dough into 1″ balls and place on an ungreased baking sheet about 2" apart. I like to use a small scoop to portion the dough into uniformly sized balls. Press down in the center of each ball with your thumb to create an indentation. Place a cherry in the center of each cookie’s indentation.

In a small saucepan over medium to medium-low heat, combine the chocolate chips and sweetened condensed milk. Heat until chocolate is melted. Stir in 4 teaspoons of reserved cherry juice until mixture is completely smooth. Turn off heat and let saucepan sit on warm burner. Spoon about 1 teaspoon of this chocolate frosting over each cherry, spreading to cover the cherry fully. If the frosting is too thick, just add a little more of the reserved cherry juice to thin it out. Sometimes it also helps to warm the saucepan again - just turn the heat back to low.

Bake for 10 minutes. Remove to wire rack to cool completely.