A slider bar should have everything guests need to create the perfect slider! Your condiment bar will likely include buns, patties, diced onions, chopped pickles, sliced tomatoes, condiments, plates, cutlery, and napkins. If you have a lot of toppings but don’t have many serving bowls, you can use a muffin tin, small mason jars, or even plastic cups to contain toppings and condiments.