Preheat the grill to medium-high heat. Remove burger patties from the freezer.
Separate the patties and remove the papers.
Place the frozen patties on the grill and cook for about 15 minutes, flipping every 5 minutes (or until the burgers are cooked through to an internal temperature of 160°F). If they were not seasoned, you can season them with some salt and pepper once they start to thaw on the grill. If you are adding cheese slices, add them during the last minute or two.
Remove the burgers from the grill and let them rest for 5 to 10 minutes. Toast the buns lightly, if desired. It should take only 1 to 2 minutes. Add the patties to the hamburger buns with toppings and condiments of your choice. Serve!
Notes
Nutrition info. The nutrition information is for 1 standard burger patty, so keep in mind that this will vary.
Flare ups. Keep an eye on the burgers for flare ups. If they are flaring up too much, move them so they aren't over direct flame and/or close the lid.
Hot spots. Be aware that some parts of the grill are hotter than others, so move the burgers around depending on their doneness.
Lid closed or open. If it's a windy day or the grill doesn't seem to be cooking the burgers fast enough, you can close the lid to retain more heat but keep an eye on them. This works well especially if the burgers are on the thicker side (over ¾ inch). However, I find that my burgers cook just fine with the lid open.
Separating the burgers tip. If they don't separate easily by hand, I like to place the frozen burgers on a cutting board on their side and carefully wedge a butter knife in between the patties where there is a groove. Then I gently tap in a downward motion towards the cutting board. They should come apart quite easily and quickly this way.
Seasoning. You shouldn't have to season frozen burgers as they are typically already seasoned and good to go. If they aren't seasoned, however, you can sprinkle them with some salt and pepper after they have thawed for a few minutes or while they are cooking.
Storage. Frozen burger patties can last up to 4 to 5 months in the freezer, depending on how well you package them. If you were to thaw them in the refrigerator, they should be cooked within 1 to 2 days. Cooked burgers will last up to 3 to 4 days in the fridge, covered.