Toasted Bittersweet S'mores Bars
- 6 oz. chocolate (bittersweet or semisweet), chopped
- 18 large marshmallows, cut in half crosswise
- 1 cup graham cracker crumbs
- 8 Tbs. unsalted butter, divided
Heat the oven to 350°F. Line an 8-inch-square baking dish with foil, leaving about 1 inch hanging over 2 edges. Lightly coat the bottom and sides with cooking spray. Make room in the fridge. Put 3 Tbs. of the butter in a medium, heatproof bowl and heat in a microwave or over simmering water unti...