Preheat oven to 350°F and line a large baking sheet with parchment paper. Spread out hte graham crackers in a single layer on the baking sheet.
In a small saucepan, add the butter, granulated sugar, brown sugar, and vanilla extract. Place mixture over medium heat, whisking consistently, bring the mixture to a boil. Once the mixture is boiling, stop stirring and let it boil for 2 minutes untouched. Remove the caramel toffee mixture from the heat and pour it over the graham crackers. Using an offset spatula or regular spatula, spread the toffee over all the crackers. Bake for 5 minutes and then sprinkle the chocolate chips over the entire pan. Return it to the oven and bake for an additional 4 minutes.
Sprinkle the crushed graham crackers on top. Let the Christmas crack cool and fully set on the baking sheet before breaking it into pieces and serving.
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Notes
To speed up cooling time, place the crackers into the refrigerator after the pan has cooled to room temperature. Refrigerate until ready to serve.
Spread the hot toffee mixture onto the crackers immediately after removing it from the stove. As the caramel toffee mixture cools, it thickens and becomes harder to spread.
Do not touch the caramel toffee mixture while it is hot. It can cause serious burns and will adhere to the skin instantly.
For easy cleanup, place all of the utensils used into the pot that held the toffee mixture and fill it with water until everything is completely submerged. Bring it to a simmer on the stove and all of the toffee mixture will magically evaporate!
Store leftovers in an airtight container and keep in the fridge for up to 2 weeks or for longer term storage, store in the freezer for up to 3 months.