01 -
Line a 9x9 inch baking pan with parchment paper and butter thoroughly. Set aside.
02 -
In a large, heavy-bottomed saucepan, melt unsalted butter over medium-low heat. Add dark brown sugar and stir until fully incorporated. Mix in light corn syrup. Continue cooking until sugar dissolves and the mixture is well blended, about 3 minutes.
03 -
Stir in sweetened condensed milk and increase heat to medium. Cook mixture, stirring constantly, until it reaches 238°F to 240°F on a candy thermometer, approximately 20 to 30 minutes.
04 -
Remove pan from heat and gently stir in vanilla extract. Immediately pour the hot mixture into the prepared pan.
05 -
Allow caramel to cool at room temperature for 3 to 4 hours, or until fully set. Do not cover during cooling.
06 -
Lift set caramel slab from pan using parchment paper. Cut into desired size pieces with a sharp knife.
07 -
Individually wrap each caramel in waxed paper to store and serve.