Line a 15x10x1-inch baking sheet with the saltine crackers. Set aside. Preheat oven to 375°F.
In a small saucepan over medium-high heat, melt butter. Add in sugar and bring to a rolling boil, stirring constantly. Once it begins to boil, remove from heat.
Pour over saltine crackers. Place in a 375°F oven for about 10 minutes, until crackers are browned and caramelized.
Sprinkle with white chocolate chips and allow to sit for several minutes (until they melt). Spread with a spatula evenly over crackers and immediately sprinkle with crushed candy.
Allow chocolate to set.
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Notes
The best way to prevent sticking it to line your pan with parchment paper before adding the crackers. If you don't have parchment paper or are still having trouble with sticking, try removing the crackers from the pan before they're totally cooled and hardened. Use a metal spatula to transfer them to a counter top lined with foil or a wire rack to finish hardening.
This recipe totally works with milk chocolate or dark chocolate to make a chocolate peppermint toffee! I find the white chocolate version to be prettier but both taste delicious.
One of the reasons I love making cracker toffee so much is that no candy thermometer is needed. Just make sure to bring the butter and sugar to a full rolling boil before removing it from the heat.
Store toffee in an airtight container at room temperature for up to 5 days.