1. Preheat the oven to 350°F (175°C) and line cookie sheets with parchment paper.
2. Combine the flour, baking soda, baking powder, salt, and cocoa powder in a medium mixing bowl and set it aside.
3. In a large bowl, beat the butter and sugar together on medium speed until it is light in color.
4. Add the egg and vanilla extract to the wet ingredients, scraping down the sides of the bowl to ensure everything is thoroughly combined.
5. Slowly beat in the flour mixture until a soft dough forms.
6. Shape the dough into 1-inch balls and place them about 2 inches apart on the parchment paper-lined baking sheet. Press the dough balls down with the palm of your hand or a spatula, as these cookies do not spread much while baking.
7. Bake one cookie sheet at a time for 8 to 10 minutes.
8. Remove the cookies from the oven and allow them to cool on the baking sheet for a few minutes before transferring them to a wire rack.
9. combine the chocolate chips and sweetened condensed milk in a small saucepan. Cook over low heat, stirring until the chocolate is melted and smooth. Stir in the reserved 4 teaspoons of cherry juice to enhance the flavor. If the mixture is too thick, you can thin it with more cherry juice.
10. Spoon 1 teaspoon of the chocolate mixture over the center of each cookie, spreading it to cover the center. Top each cookie with a maraschino cherry.
11. Allow the chocolate to set and store it in an airtight container in a single layer.