Here is the recipe (I got it from my friend, Leslie..she used to give me little gift bags of them that I'd hoard for myself before I finally asked for the recipe!)
Leslie's Homemade Caramels: Just half the ingredients if you want a smaller size)
In a LARGE heavy kettle combine:
4 cups white granulated sugar
4 cups light Karo syrup
Bring to a boil over medium heat until a candy thermometer registers 245 degrees, stirring frequently.
1 cup butter until melted.
Then slowly add 3 cans Carnation evaporated milk so it doesn't curdle.
Bring to a rapid boil at medium-high heat up to 240 degrees stirring constantly so bottom doesn't scorch. This is a slow process, but be patient so they harden correctly. It's nice to have a backup stirrer or a stool to sit on while doing this stage.
Then remove from heat and add:
1/4 tsp salt
2 teaspoons good vanilla
Pour into a PARCHMENT papered jelly roll pan to completely cool before cutting and wrapping into caramels.