Step 1

Place the dark chocolate in a shallow, wide bowl and heat in the microwave in 20 second increments, stirring in between, until melted and smooth.

Step 2

Place the sprinkles in another shallow wide bowl or rimmed plate.

Step 3

Dip the top of each heat-safe glass in the melted chocolate, then immediately coat in the sprinkles.

Step 4

Set aside while you prepare the hot cocoa.

Step 5

In a medium saucepan, whisk together the sugar, black cocoa powder, salt, and water.

Step 6

Bring to a simmer over medium heat and cook, whisking often, until all the powder has dissolved.

Step 7

Slowly whisk in the milk and continue to cook until heated through.

Step 8

Remove from heat and whisk in the vanilla extract.

Step 9

Serve immediately in sprinkle-rimmed heat-safe glasses if desired.