Bring the heat up to medium and cook mixture until 244 degrees F or softball stage.
Remove from heat and stir in baking soda until completely combined.
Add butter and vanilla. Stir until butter has melted and the mixture is smooth.
Let rest for 20 minutes.
After the mixture has rested, stir in nuts and mix until the sheen has gone. Transfer to prepared baking dish.
Let cool 1-2 hours or overnight. Cut into small squares to serve.
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