Line a baking sheet with parchment paper, then line out saltines in a single layer (leaving no gaps).
In a sauce pan over medium heat, melt butter. Once melted add brown sugar. Stir together until the mixture just begins to bubble. Pour mixture over crackers. Use a spatula to even out the mixture and cover all the crackers.
Place in oven to bake for 5 minutes. Remove from oven (and turn oven off)
Sprinkle evenly with both types of chocolate chips. Place pan back into turned off oven and let sit for 3-5 minutes. The chips should be melted just enough to make them spreadable. Again, use a spatula to even out the chocolate to evenly coat the crackers.
Let cool on the counter for 15 minutes before placing in the refrigerator for at least 2 hours. Once the chocolate is set, you should be able to break off pieces (larger or small). Store in cool, dry place.
You can add sprinkles or nuts to the top right after smoothing out warm chocolate, if desired.
Keyword brown sugar, butter, chocolate, chocolate chips, saltines, toffee