This recipe makes a delicious "candy" that tastes like Heath bars. I often take this to potlucks and NEVER have leftovers...and I've learned to carry a few copies of the recipe with me because I'm ALWAYS asked for it.
In a medium saucepan, preferably nonstick, place the butter and brown sugar and cook over medium heat. After the butter has melted, stir mixture lightly, then increase heat. Bring to a boil and boil for 4 minutes without stirring. Remove from heat.
Meanwhile, preheat oven to 350. On a 9 X 13 cookie sheet lined with foil, spread the saltine crackers in an even layer, trying to keep the sides touching.
Pour the butter/brown sugar mixture over the crackers very quickly. You will want to have a spatula ready to spread the butter to cover all the crackers. Bake for 10 mins.
Remove crackers from oven then sprinkle both types of chips over the crackers. Let sit for 2-3 minutes until chips soften, then use spatula to spread evenly and mix the chips together. This will take a couple of minutes. Place baking sheet in the refrigerator and let candy chill for about 2 hours. Break into chunks and store in an airtight container.