I've never made this without being asked for the recipe:

Line a buttered cookie sheet with saltine crackers (about one sleeve)

In a sauce pan mix:
1 cup butter
1 cup packed dark brown sugar

Bring to a boil and boil for 4 minutes.

Pour over the saltines, then place in a preheated 375 degree oven for five minutes.

Removed from oven and sprinkle with one package semi-sweet chocolate chips.
Spread with spatula so the chips melt over the top and spread smooth. Sprinkle with 1/2 cup chopped pecans. Cool. Refrigerate. When hard break into pieces and serve.