1. Preheat oven to 350°F (175°C) and line two baking sheets with parchment paper.

2. Cream the softened butter and sugar in a large bowl until fluffy.

3. Add eggs and vanilla extract; mix until fully combined.

4. In another bowl, whisk together flour, cocoa powder, baking soda, and salt.

5. Gradually add dry ingredients to the wet mixture and mix until a soft dough forms.

6. Scoop tablespoon-sized dough onto the baking sheets, spacing evenly.

7. Bake for 10 minutes, then press a halved marshmallow into each cookie.

8. Return to oven for 2 more minutes, just to soften the marshmallows.

9. In a microwave-safe bowl, melt chocolate chips with heavy cream in 30-second bursts, stirring in between, until smooth.

10. Spoon chocolate glaze over the marshmallows and immediately top with sprinkles.

11. Let cookies cool on a wire rack until the glaze sets.