Line your rimmed baking sheet with a layer of parchment paper (NOT waxed paper!) or a baking mat.
In a heavy-bottom saucepan, combine granulated sugar, corn syrup and bourbon. Cook over heat until the mixture reaches 270 degrees F.
Once the mixture reaches 270 degrees F, stir in the peanuts.
Stir frequently as you continue to cook the mixture to a temperature of 300 degrees F.
Immediately remove from the heat; stir in softened butter, vanilla extract and baking soda. Immediately pour out onto the prepared baking sheet and spread out with a spatula to form a thin layer (should spread to 9x12 or slightly less).
Let cool completely. Once cooled, break into pieces.
Notes
Store in airtight container; when stored properly, will keep for 2-3 weeks.