First, you’ll want to make the caramel for your chocolate bar since that takes the longest time to set. Put all your caramel ingredients (except for the vanilla extract) into a small pot over medium heat and stir to combine them while the pot heats up and starts to boil. Once the pot is boiling, insert a candy thermometer and leave the pot alone (do not stir!) until the temperature reaches 250°. It will take a little bit for the temperature to get up that high, so just keep checking back in. But once the temperature reaches the 220-230° range, it will go up pretty quickly after that, so just stand near the pot. Once it reaches 250°, take the caramel off the stove and stir in your vanilla extract.
Give the caramel a few minutes to cool, and while it’s cooling, put some oil (I used refined coconut oil) on a piece of parchment paper and spread your caramel over an area that big enough to cover your chocolate bar mold. Place your caramel in the fridge for a few hours until set.
While the caramel is setting, use a double boiler or a glass bowl over a pot of simmering water to melt half of your chocolate chips (1/3 cup) and spread them into the bottom of a chocolate bar mold (or a very small bread loaf pan would work too). You want to just cover the bottom of the mold, so make sure to leave room for the rest of your layers.
When your caramel is set, take it out of the fridge and use a pizza cutter to cut the caramel into a rectangle that’s slightly smaller than your chocolate bar mold. Place it caramel side down onto your chocolate bar and peel off the oiled paper so it’s sitting on top of your chocolate layer. If for some reason your caramel doesn’t come off the paper like it should (sometimes making caramel can be finicky), you can always scrape it off and use an oiled spatula to kind of spread it out over the chocolate. It may not be as pretty, but will still taste good!
Once your caramel is in place, melt the other 1/3 cup of your chocolate and spread it over top of the caramel layer. Give your rice crisp cereal a few chops with a knife to break up the cereal a bit and then spread them out over the chocolate and push them down into the chocolate with the back of a spoon.
Place your bar in the fridge to fully set, pop your candy out of its mold and your yummy treat is ready to eat! You’ll want to store any uneaten parts of the candy bar in the fridge, wrapped in wax paper.