1. Bring a large saucepan of water to a boil. Dip apples in boiling water for a few seconds, using a slotted spoon, then dry with paper towels to remove any wax from the peels. Set apples aside to cool completely, about 30 minutes.

2. Insert sticks into the bottom of each cooled apple through the core for a handle.

3. Line a baking sheet with parchment paper.

4. Stir brown sugar, sweetened condensed milk, corn syrup, and butter together in a saucepan over medium-high heat. Bring to a boil, stirring constantly, then reduce heat to medium. Cook until a candy thermometer reads 248 degrees F (120 degrees C), stirring constantly to prevent burning, about 25 to 30 minutes. A teaspoon of caramel dropped in a glass of cold water, should form a firm ball. Remove caramel from heat and stir in vanilla extract.

5. Working quickly, dip each apple into the hot caramel to completely coat the apple and about 1/2 inch of the wooden handle. Sprinkle apples with any desired toppings while still hot. Let caramel apples cool on the prepared baking sheet, about 1 hour. Use caution, caramel is very hot.

Cook's Note:

Because the caramel requires constant attention when cooking and you will be in a hurry when coating the apples, prep everything beforehand. Have your parchment paper laid out, your toppings ready in bowls, etc. Also, each stove differs as far as temperature and how long you will need to cook caramel. It only took 21 minutes for me, but took a friend 39 minutes, so it can vary greatly.