Preheat your oven to 400°F. This high temperature ensures the toffee cooks evenly and achieves that crunchy texture we love. While the oven heats, prepare your baking sheet by lining it with heavy-duty aluminum foil for easy cleanup. Don’t forget to spray it with nonstick spray to prevent sticking.
Next, lay out the Saltine crackers on the baking sheet. Arrange them salt-side down in a single layer, covering the entire sheet. This will be the base for your delicious toffee.
In a saucepan, melt the unsalted butter over medium-low heat. Stir it gently until it's completely melted and begins to bubble. This step is crucial as it sets the stage for the toffee’s texture and flavor.
Add in the dark brown sugar to the melted butter and mix well. Increase the heat slightly until the mixture comes to a rolling boil. It's important to keep stirring to avoid burning.
Once it reaches a boil, let it bubble for 4 to 5 minutes. You'll notice the color changing to a lighter caramel hue. Keep an eye on it, as you want it to thicken and become bubbly but not burn!
After boiling, carefully pour the butter and sugar mixture over the arranged Saltine crackers. Make sure to cover them evenly, allowing for a rich toffee layer on each cracker.
Pop the baking sheet into the oven and bake for 5 minutes. This step helps the flavors meld together and creates that delightful crunch.
Once baked, remove the sheet from the oven and let the toffee cool for about 1 to 2 minutes. While it’s cooling, sprinkle the semisweet chocolate chips and milk chocolate chips on top. The warmth from the toffee will melt the chocolate chips beautifully.
After a few minutes, use a spatula to carefully spread the melted chocolate over the crackers, making sure to cover each one. This chocolate layer is what makes the Saltine Cracker Toffee irresistible.
Finally, let the toffee cool to room temperature before transferring it to the refrigerator. Allow it to chill until it’s firm, which usually takes about 30 minutes. Once set, break the toffee into rough pieces and enjoy!