Preheat oven to 350°F. Line baking sheets with parchment paper.

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

In a stand mixer, mix butter, sugar, salt, baking powder, and baking soda at medium speed until light and fluffy.

Add egg and vanilla; mix well, scraping the bowl as needed.

Gradually add flour mixture to the wet ingredients until well combined.

Drop 1-tablespoon portions of dough onto prepared baking sheets, leaving about an inch apart.

Make an indent in the center of each cookie with your thumb or a small teaspoon.

Place one maraschino cherry in each indentation.

In a saucepan, heat chocolate chips, condensed milk, and cherry juice over medium-low heat, stirring until melted and smooth.

Fill each cherry indentation with the melted chocolate mixture, covering the cherry completely.

Bake for 9 minutes. Cool on sheets briefly, then transfer to wire racks to cool completely.