Ingredients

Vegetable oil cooking spray 

Bittersweet, milk, or white chocolate, chopped, according to variation 

Toppings, according to variation 

Preparation

Coat a 9-by-12 1/2-inch rimmed baking sheet withcooking spray, and line with parchment, leaving anoverhang on ends.

Melt chocolate in a double boileror a heatproof bowl setover a pan of simmering water,stirring. Pour into baking sheet,and spread in an even layer.

Immediately sprinkle toppingsover chocolate. Refrigerateuntil firm, about 1 hour.Peel off parchment, and breakbark into pieces.