• 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 cookie scoop, add some batter into your hands and roll into a ball.
• Place cookies about 2 inches apart and bake the cookies for about 9-10 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. Once cookies are done baking let cool for a few minutes before transferring to a wire rack while you make the icing.

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 Tablespoons 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.

Decorate

• 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.