INGREDIENTS
3/4 cup
unsalted butter, softened
1 cup
firmly packed light brown sugar
1 cup
old-fashioned oats
3/4 cup
all-purpose flour
3/4 cup
graham cracker crumbs
1 tsp
baking powder
1 tsp
kosher salt
1 tsp
ground cinnamon
2 cups
marshmallows, halved crosswise
2
semisweet chocolate bars, coarsely chopped
Garnish: melted chocolate