Line a jelly roll pan with aluminum foil and spray foil with cooking spray.
Lay crackers evenly over foil, salted side up.
Preheat oven to 400 degrees.
In a small saucepan, bring butter and brown sugar to a simmer over medium heat. While the butter is melting, stir frequently to mix evenly. Once mixture simmers, let simmer without stirring for 3 minutes.
Remove from heat and pour evenly over crackers.
Place in oven for 5 minutes.
Sprinkle chocolate chips on top. Return pan to oven for 30 seconds to help melt the chips.
Use a spatula or knife to spread melted chocolate evenly.
Sprinkle pecans on top. Cover with aluminum foil so that foil doesn't touch and place in refrigerator for 2 hours.
Break into pieces.