Mix the graham cracker crumbs, sugar and butter and press them into the bottom of a greased 8 inch square baking pan.

Bake in a preheated 350F oven until lightly golden brown, about 8-10 minutes and set aside.

Melt the bittersweet chocolate and butter in a bowl for 2 minutes in microwave. Take out after 1 minute and stir.

Remove and stir in the cocoa powder and sugar .

Place chocolate mix in mixer bowl and whisk in the vanilla extract and eggs, one at a time, beating well after each addition.

Finally, stir in the flour, salt and semi-sweet chocolate chips

Pour into the prepared pan and bake for about 25-30 minutes, or until a toothpick inserted in the center comes out with a little batter and a few moist clumps clinging to it.

Turn oven to broil.

Sprinkle marshmallow pieces over top of brownies. Place back in oven on top rack for 1 minutes.

Watch through oven window, as soon as marshmallows start to brown remove from oven and let cool on a wire rack.