Preheat your oven to 400°F (200°C). Line a 10x15-inch baking sheet pan with aluminum foil or parchment paper and spray it with non-stick cooking spray for easier removal.
Place the saltine crackers in a single, even layer on the prepared baking sheet. Set aside.
In a medium saucepan, melt the butter and brown sugar over medium-high heat. Stir constantly and bring the mixture to a boil making sure to scrape the bottom of the pan. Once boiling, continue to boil for about 2-3 minutes, stirring occasionally.
Gently pour the hot toffee mixture over the cracker layer, ensuring it is spread evenly with a spatula.
Bake in the preheated oven for 5 minutes or until the toffee is bubbly and the crackers are golden.
Take the pan out of the oven and quickly sprinkle the chocolate chips evenly over the hot toffee layer.
Allow it to sit for a few minutes to melt, then gently spread the melted chocolate over the crackers using a spatula.
Evenly sprinkle the chopped pecans over the chocolate, then allow the entire sheet to cool at room temperature. Once cool, add extra holiday sprinkles for a festive touch, if desired.
Once the toffee has hardened, break it into pieces. Serve and enjoy!
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Notes
Boil the toffee exactly 2 to 3 minutes. Too short and it stays sticky. Too long and it burns.
Have chocolate chips measured and ready before the pan goes in the oven.
Line the pan and spray it. The toffee sticks.
Let cool completely before breaking or the chocolate smears.
Swap semi-sweet for milk, dark, or white chocolate chips.
Store in an airtight container with wax paper between layers. Freezes up to 2 months.