Slow cooker cheeseburger casserole an easy & flavorful recipe the entire family will enjoy. The cheeseburger is classic American dish for a reason. From the seasoned beef patty to the melted cheese, it’s a staple in American cuisine. Here I take all the deliciousness of a cheeseburger and turned it into a casserole! Meat, cheese, mustard, relish, etc…all the traditional components are here. This kid-friendly crockpot casserole will soon be rotation in your household.