Turn oven to 350 degrees.

Line a 10" by 15" Cookie sheet with parchment paper. Lay out the crackers in 10 rows of 4.

In a small sauce pan add the butter and brown sugar. Melt over medium heat. Stir the mixture often. Bring to a boil and let boil for 4-5 minutes. 

Gently pour over the crackers and lightly spread.  Bake for 5 min.

Remove from oven and sprinkle with the dark chocolate chips.

Spread evenly over toffee.

Cool