Line a 10x15 (jelly roll) pan with parchment paper, and light grease. Set it aside.
Add the sugar, corn syrup, butter, and salt to a large, heavy bottomed pot and heat it over medium on the stove top. Stir occasionally as the mixture comes to a boil. 2 cups granulated sugar, 1 cups light corn syrup, 1/2 cup unsalted butter, 1 teaspoon salt
2 cups granulated sugar, 1 cups light corn syrup, 1/2 cup unsalted butter, 1 teaspoon salt
Once boiling, very slowly add the evaporated milk a little at a time, about 1 TBS every 30 seconds, stirring constantly. It will take between 10 and 15 minutes to add the can, and you need to stir the whole time so the milk doesn't lower the temperature of the mixture. 12 oz evaporated milk
Once all the milk has been added, add in a candy thermometer and continue cooking, stirring constantly until the mixture comes between 240 to 242 Fahrenheit.
Once the temperature is reached remove from the heat and stir in the vanilla extract. 1 tsp vanilla extract
Pour the mixture into the prepared pan, and spread out the top as needed.
Let the caramels cool until totally set, you can place it in the fridge or about 30 minutes, to speed it up.
Cut the caramel into 4 portions.