Line a baking sheet pan with parchment paper or a silicone baking mat and set aside.
In a saucepan over medium heat, combine butter, 1 cup granulated sugar, and salt. Bring the mixture to a boil, then continue to boil, stirring consistently for 5-7 minutes or until the mixture reaches a caramel color.
Quickly remove from the heat, stir in the vanilla extract, and pour onto the prepared baking sheet. Using an offset spatula, spread the toffee to your desired thickness, then set aside.
Add the white chocolate chips into a microwave safe bowl and microwave in 30 seconds intervals, stirring in-between, until melted and smooth.
Spread the melted chocolate onto the surface of the toffee, then stir together the remaining sugar and cinnamon and sprinkle the cinnamon sugar mixture on top.
Allow the toffee to set and chocolate to harden. When set, break into pieces!