- 8 cups puffed wheat cereal
- 1 cup brown sugar, not packed
- 1/2 cup butter
- 1/2 cup corn syrup
- 3 tablespoons Dutch-process cocoa (such as Fry's®)
- 2 teaspoons vanilla extract
- Line a 9×13-inch baking pan with parchment paper.
- Place puffed wheat cereal in a large bowl.
- Combine brown sugar, butter, corn syrup, and cocoa in a saucepan. Bring to a boil; cook, stirring constantly, until sugar is dissolved, about 2 minutes. Remove from heat. Stir in vanilla extract.
- Pour sugar mixture over puffed wheat cereal in the bowl; stir until cereal is evenly coated. Spread evenly into the lined pan. Cool until set, about 30 minutes. Cut into squares.