Preheat oven to 400 degrees F (205 degrees C). Cover a sided cookie sheet with aluminum foil and line crackers on foil.
Combine butter and brown sugar in a saucepan. Stirring constantly, bring to a boil and boil for 3 minutes. Pour over crackers completely.
Bake for 5-6 minutes, watch carefully. Remove cookie sheet from oven, place it on oven door and sprinkle chocolate chips over baked crackers. When chocolate gets soft, spread over crackers with back of a spoon. Sprinkle slivered almonds on melted chocolate. Place in refrigerator for at least 8 hours. Break into cookie-size pieces. This recipe freezes well.