Put the frozen quarter-pounder beef burger on a dish that can be heated in the microwave, cover it with clingfilm or a microwave splatter guard, and make sure there is a little vent hold (drill a hole in the clingfilm!). Cook the burger according to the manufacturer’s instructions. Your quarter-pounder burger should be cooked in the microwave at full power (800 watts) for 1 minute and 45 seconds. You should give the burger as much as a minute to “rest.”