Chocolate-covered potato chip toffee

Ingredients:

• 220 g butter + extra for greasing the baking sheet
• 5 cups thick potato chips
• 1 cup of sugar
• 2 tsp vanilla extract
• 2 tablespoons apple or white vinegar
• 150 g bitter or dark chocolate, finely chopped

Preparation:

1. Line a baking sheet with foil and grease the foil with butter. Set aside 1 cup of potato chips; break the remaining 4 cups of chips in half if they are large.
2. Combine the butter, sugar, vanilla, and vinegar in a saucepan and cook over medium heat, stirring occasionally, until the mixture turns light amber and a syrup thermometer registers 160°C (320°F), about 10 minutes. Remove from heat and stir in 4 cups of chips. Immediately transfer the mixture to a baking sheet and spread into a thin layer. Gently press the reserved chips on top and let the toffee set.
3. Place about 3/4 of the chocolate in a glass microwave-safe bowl and microwave for 30 seconds. Stir, then continue heating in 30-second intervals, stirring, until completely melted. Add the remaining chocolate and microwave until smooth, about 4 minutes.
4. Drizzle the chocolate over the toffee. Set aside to let the chocolate set, about 20 minutes. Break the toffee into pieces.