This video by Tasty Food sounds good and easy-to-do. Here's what you need:

1 tube of saltines (40 crackers), 1 cup (2 sticks) butter (either salted or unsalted; do not use margarine), 1 cup + 2 Tbsp. firmly packed brown sugar (light is preferred), 1 bag chocolate chips (I like semi-sweet), 1/2 to 3/4 cup toasted chopped pecans (or toasted chopped almonds).

For the procedure, preheat the oven to 350 degrees, line cookie sheet with foil, and spray with non-stick cooking spray. Line crackers end to end on sheet, breaking crackers to fit the end if necessary.

Then in a saucepan, melt butter on low heat. Once melted, add brown sugar and turn heat to medium. Continue stirring until boiling – then boil for 3 minutes (set timer).

Next, pour over crackers, spread evenly working quickly. Put sheet into oven – bake for 5 minutes. Remove – pour chocolate chips over top – place a sheet of foil over and let melt for 3 minutes. Spread melted chocolate over the top evenly. Add nuts to top – replace foil and refrigerate until set.

For a step-by-step guide, watch the video tutorial below.