Place popsicle sticks in each apple and place them in the fridge for a few hours - or overnight - to chill. (Caramel sticks better to chilled apples than room temperature apples.)
When you're ready to make the caramel apples, combine cream and rapadura sugar in a medium pot. The mixture will bubble up quite a bit so make sure there is a lot of room at the top, but you need the mixture to be deep enough to get a good reading with your candy thermometer. The mixture will bubble up quite a bit so make sure there is a lot of room at the top, but you need the mixture to be deep enough to get a good reading with your candy thermometer. I don't have a pot that is both smallish and deep, so I use a one-quart pot and then attach my candy thermometer to a stainless steel steamer pot that sits right behind it.
Clipping your thermometer means you don't have to hold it, and allowing for constant reading to be taken ensures better accuracy.
Bring mixture to a boil and then reduce heat to medium - I set my stove to just a little over the exact medium mark. Stir often, then when the mixture reaches 225°F stir constantly until it reaches 240°F to prevent the caramel from burning.
When the caramel reaches 240°F, quickly pour it into into a small bowl and allow it to cool until it has thickened a little. It should still be warm when you start dipping the apples.
Dip the apples and set them to dry on a piece of parchment paper. As they're setting you might think you've done something wrong because they will will look like this.
Don't worry! After you've finished dipping the apples, you can slide a baking sheet under them and carry them to the fridge to set. This step is optional, but helpful in my opinion. Once the caramel has set on the cold apple, you can mold the caramel with clean hands if you need to. Just lift the apples off the parchment paper and remove the excess caramel at the bottom of the apple. You can stick it onto the apples in any places that were missed or eat it - I won't tell.
Finally, if you want to add any toppings, place them on a flat surface and roll the caramel apples over it. Store in the fridge until you're ready to serve.