Potato Chip-Chocolate Toffee

Ingredients

• 2 tablespoons apple cider vinegar white
• 5 cups potato chips thick-cut
• 5 ounces bittersweet chocolate finely chopped
• 1 cup sugar 
• 2 sticks butter unsalted plus more for the baking sheet
• 2 teaspoons vanilla extract 

Equipment

• bowl
• baking sheet
• sauce pan
• aluminum foil
• microwave
• candy thermometer

Directions

1. 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.
2. 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.
3. 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.
4. 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.
5. Add the remaining chocolate and stir until smooth, about 4 minutes.
6. Drizzle the chocolate over the toffee. Set aside to harden, about 20 minutes. Break the toffee into pieces.
7. Photograph by Stephanie Foley