Preheat oven to 350° F. Prepare a 13x9 inch pan with parchment paper.
Lay pretzel chips across the bottom of the lined pan creating just 1 layer. Fill as many holes as possible.
Heat butter in a small sauce pan on the stove set to medium. Once the butter has melted add your brown sugar and stir, bringing mixture to a boil. Boil for 3-4 minutes, stirring continuously. The toffee mixture should be very thick and sticky.
Carefully pour the mixture on top of the laid-out chips and spread evenly with an offset spatula.
Place pan in the oven for about 8 minutes. Watch carefully. The toffee mixture should be bubbling, but not burning. Remove from oven.
Evenly sprinkle all the dark chocolate chips across the top of the boiling toffee. Cover the pan loosely with foil and let melt for 5 minutes.
While the dark chocolate is melting, place another small sauce pan on the stove over medium low with the white chocolate and olive oil. Stir until melted.
Peel back the foil from the pan with toffee. The chocolate should be melted from the heat of the pan. Use an offset spatula to spread the chocolate evenly.
Pour the white chocolate into desired design (I drizzled in a zigzag).
Add sprinkles (or additional toppings) on top of the chocolate.
Cover it back up with foil and place it on a hot pad in the refrigerator for 1-2 hours for it to set. If you have the time, overnight is best.
When it is set, peel the toffee from the parchment and crack into pieces by hand or by smashing.
These should be kept in an airtight container and if it's warm out you can store it in the fridge.
Enjoy!
Notes
- Chocolate Chips: You can use your favorite chocolate chips for this recipe. I like to use chips versus bars for this recipe as it re-hardens nicely.- Toppings: You can add different sprinkles, freeze dried fruits, nuts, more chocolate, or even edible flowers.