01 -
Preheat oven to 200°F. Line a baking sheet with heavy-duty aluminum foil and generously coat with nonstick cooking spray.
02 -
Place pretzels in a large, heatproof mixing bowl.
03 -
In a 3- to 4-quart saucepan over medium heat, combine packed light brown sugar, sliced butter pats, and light corn syrup. Stir constantly and bring to a gentle boil. Maintain boiling for 5 minutes.
04 -
Remove saucepan from heat. Carefully stir in pure vanilla extract and baking soda. Mixture will bubble vigorously; stir until homogenized.
05 -
Immediately pour hot toffee over pretzels. Using a wooden spoon or silicone spatula, stir gently to fully coat pretzel pieces.
06 -
Spread coated pretzels evenly on prepared baking sheet. Evenly sprinkle half of the Heath toffee bits over the top.
07 -
Bake pretzels for 60 minutes, turning every 15 minutes to ensure even toffee coverage.
08 -
Immediately upon removing from oven, sprinkle remaining Heath toffee bits over pretzels.
09 -
Allow toffee-coated pretzels to cool completely before breaking into clusters for serving.