• Cream together butter, white sugar and brown sugar until fluffy.
• Mix in eggs, one at a time and add vanilla.
• In small bowl, whisk together flour, cocoa powder, baking soda and salt.
• Add dry ingredients, in two batches, to the butter and sugar mixture. Mix until completely incorporated.
• Stir in chocolate chips.
• Drop 1 tablespoon of cookie dough onto parchment paper, the cookies will spread so place them 2 inches apart.
• Bake in 350°F oven for 12-15 minutes.
• Set aside, to completely cool before topping with the marshmallow frosting.

Marshmallow Frosting

• For the frosting, you will need to create a double boiler. A double boiler is simply a saucepan with an inch of simmering water, with a heat proof mixing bowl placed on top of the saucepan. This will cook the egg whites gently, without scrambling the egg whites.
• Whisk together egg whites, sugar and cream of tartar in a heat proof mixing bowl and place over a sauce pan of simmering water...whisk constantly to dissolve the sugar, about 1-2 minutes.
• Once the sugar has dissolved, pour egg whites into electric mixer and beat with whisk attachment until soft peaks form...about 5-7 minutes.

  Whisk in vanilla and salt.
• Use an offset spatula to spread the marshmallow frosting onto the cookies. Alternately, add the marshmallow frosting to a piping bag and pipe the frosting onto the cookies.
• Turn the oven broiler on and place frosted cookies onto parchment paper lined baking sheet.
• Place cookies under the broiler to toast the marshmallow...this will take seconds...don't even close the door and certainly don't walk away.
• Let the cookies cool and enjoy.