INGREDIENTS
1/2 cup
unsalted butter
1 cup
Imperial Sugar Granulated Sugar
3/4 cup
unsweetened cocoa powder
1/4 tsp
kosher salt
1/2 tsp
vanilla extract
1/2 tsp
espresso powder (optional—will enhance the chocolate flavor)
2
large eggs
1/4
cup, plus 2 tablespoons all purpose flour
3/4 cup
mini marshmallows
6 tbsp
graham cracker crumbs (about 4 full sheets, crushed)