Preheat oven to 400 degrees
Line a cookie sheet with tin foil, shiny side up. Fill the sheet with a single layer of saltine crackers. About 40 should do it.
In a saucepan melt 1 cup of butter.
Add I cup of brown sugar.
Bring to a boil and boil for 3 minutes.
Pour over your crackers and spread to completely cover them.
Pop in the oven and bake for 6 minutes.
Remove from the oven and sprinkle with 2 cups of semi sweet chocolate chips. Wait for about two minutes until they begin to melt and then spread the melted chocolate over the top with a spatula. You'll probably want to rush the waiting for them to melt part, you can't.. just wait..they'll melt.
Sprinkle with finely chopped pecans.
Let cool completely then break into pieces.