How do you keep burgers warm in a roaster?
How to Keep Hamburgers Warm Without Drying Out Fill an oven-safe saucepan with broth. If your hamburgers are beef, use beef broth. Preheat the oven to 200 degrees Fahrenheit. Place the cooked burgers in the broth. Put the cooked hamburgers into an aluminum tray. Line the inside of a cooler with aluminum foil. Place the foil-wrapped aluminum tray inside the cooler.