Line a baking sheet with foil and butter the foil. Set 1 cup potato chips aside; break the remaining 4 cups chips in half if they're large.
Combine the butter, sugar, vanilla and vinegar in a saucepan over medium-high heat and cook, stirring occasionally, until the mixture is light amber and a candy thermometer registers 320 degrees F, about 10 minutes. Remove from the heat and stir in the 4 cups chips, then immediately pour onto the baking sheet and spread in a thin layer. Gently press the reserved 1 cup chips on top of the toffee and let cool.
Put about three-quarters of the chocolate in a microwave-safe glass bowl and microwave 30 seconds. Stir, then continue to microwave in 30-second intervals, stirring between each, until melted. Add the remaining chocolate and stir until smooth, about 4 minutes.
Drizzle the chocolate over the toffee. Set aside to harden, about 20 minutes. Break the toffee into pieces.
Tools You May Need
Photograph by Stephanie Foley
Courtesy of Food Network Magazine
Tools You May Need
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