Vegetable oil cooking spray
Bittersweet, milk, or white chocolate, chopped, according to variation
Toppings, according to variation
1. Coat a 9-by-12 1/2-inch rimmed baking sheet with cooking spray, and line with parchment, leaving an overhang on ends.
2. Melt chocolate in a double boiler or a heatproof bowl set over a pan of simmering water, stirring. Pour into baking sheet, and spread in an even layer.
3. Immediately sprinkle toppings over chocolate. Refrigerate until firm, about 1 hour. Peel off parchment, and break bark into pieces.
Movie Theater Bark
1 pound bittersweet chocolate
3/4 cup cup mini pretzels
1/2 cup salted shelled peanuts
1/3 cup raisins