1 1/2 cups all purpose flour
2 teaspoons baking powder
1 teaspoon salt
1 cup (2 sticks) unsalted butter
6 ounces unsweetened chocolate, chopped
5 large eggs
1 1/4 cups dark brown sugar
1 cup granulated sugar
2 teaspoons vanilla
1 cup graham cracker, roughly crushed with your hands
12 big marshmallows
Beat eggs, sugar and vanilla in large bowl to blend. Stir in warm chocolate mixture, then dry ingredients. Fold in graham crackers. Pour batter into prepared pan. Dot with 12 large marshmallows. Bake until toothpick inserted into center comes out with moist crumbs attached, about 30- 40 minutes minutes.
I definitely like these better the day after. Still cake-like, but moist.