Preheat the oven to 400°F.
Chop the pecans and portion the chocolate chips.
Line a rimmed baking sheet with parchment paper and place the saltines on the sheet in a single layer.
Make the caramel: Melt the butter and brown sugar together in a medium saucepan over medium-high heat. Bring mixture to a boil. Watch it closely, stirring occasionally until combined and sugar is fully dissolved. Continue boiling, undisturbed for 5 minutes.
Remove from heat and pour caramel mixture over the cracker layer. Spread out with a spatula to cover the saltines evenly.
Transfer the sheet to the oven and bake for 5-6 minutes, or until just bubbly.
Remove the sheet from the oven and sprinkle immediately with chocolate chips.
Return to the oven for 2 minutes, or until the chocolate begins to melt and look shiny.
Remove from the oven and spread the chocolate evenly with a spatula.
Immediately sprinkle with the pecans. Do this step quickly so that your toppings stick to the chocolate before it cools.
Transfer the sheet to the freezer until the chocolate is firm, about 30 minutes.
Once it is completely cool, break into pieces and enjoy!