In a double boiler, melt the butter and chocolate, stirring frequently. Once melted, set aside to cool

In a medium bowl, whisk together the flour, cocoa powder, baking powder and salt.

In a standing mixer, beat the sugar, eggs and vanilla on low speed until combined.

Add the cooled chocolate and mix until combined

Gradually add in the flour ingredients and mix until combined

Scoop the dough (Will be brownie like texture) into a bowl and cover with foil and place into the fridge for 4 hours.

Preheat oven to 325 degrees and line a cookie sheet with parchment paper.

Using a small ice cream scoop, scoop some batter into your hands and roll into a ball

Place cookies about 2 inches apart

Bake the cookies for about 10 minutes

While cookies are baking, cut the marshmallows in half

Once cookies are baked, place a marshmallow into the center of the cookies and lightly press down

Place cookies back into the oven for another 2-3 minutes

Place a wire rack over another cookie sheet to allow the icing to drip off

Once cookies are done baking let cool for a few minutes before transferring to a wire rack while you make the icing

Combine all ingredients into a large mixing bowl and mix until combined

If the icing is still to thick, add about 3 tbsp of hot water to it to thin it out

Using a spoon, spoon some icing onto the marshmallow on the cookie

Repeat step number 3 onto a few more cookies

Sprinkle a little bit of sprinkles onto the cookies

Repeat the last two steps onto the remaining cookies. Remember to only put icing onto a few cookies at a time because the icing will dry fast.

Once all the cookies have icing and sprinkles ENJOY!