When you have leftover burgers you can break them up and mix them with pasta, salads, pasta salad, soups, stews etc.
Some other things you can make with leftover burgers include.
Cheeseburger Pasta.
Shepherd's Pie.
Meaty Grilled Cheese (aka Patty Melt)
"Meatball" Sandwiches.
Hamburger Steak With Gravy.
Stuffed Peppers.
Cheeseburger and Home Fries Omelet.
Mexican Meat.
If you have already cooked leftover burgers or hamburgers you can reheat them again and eat them as is.
Preheat your oven to a toasty 400 F degrees Fahrenheit.
Put your patty directly onto a metal rack and place over a baking pan to make sure the excess fat doesn't drip all over your oven.
Place your patty in the oven for about three minutes, depending on the strength of your oven.