Espresso and Walnut Brittle

Coat a 12-by-17-inchrimmed baking sheet withcooking spray. Bring sugarand corn syrup to a boil in amedium saucepan, stirringand brushing down sides witha wet pastry brush to preventsugar crystals from forming,until sugar dissolves. Cook,swirling occasionally, untilmixture just starts to turn goldenaround edge.

Stir in mix-ins. Cook, stirringoccasionally, until mixtureis pale amber, about8 minutes. Pour onto bakingsheet without spreading.Let cool. Break into pieces.