Frozen Burgers in an Air Fryer

Doneness

Both faces show a deep mahogany sear with a hard-edged crust ring where the patty edge met the grate; the centre dome (more pronounced on frozen patties than thawed) should be a slightly lighter golden-brown. Pressed gently with tongs the patty feels firm with a slight rebound — a soft squish means it's under-cooked; rock-hard means over-cooked. Juices from a horizontal probe at 160 °F should run clear to faint pink with no red. Cheese, if added, should be fully melted and draped over the patty edges. Plant-based patties show a darker brown surface because the pea-protein-and-beet-juice formulation darkens more aggressively under heat — pull at 160 °F internal for Beyond or 165 °F for Impossible; cooking past that dries the patty into a crumbly texture within 60 seconds.

Technique

Cook straight from the freezer — do not thaw. Frozen patties actually cook better from frozen in the air fryer than from thawed; thawed patties release brine onto the basket surface and steam the bottom face grey rather than letting the convection sear develop. Arrange single-layer with ½-inch gaps between patties. Skip salt before cooking — salt draws moisture to the surface and undermines the sear; season after the flip if at all. At 6 minutes flip each patty individually with tongs — the bottom sear should be mahogany-deep and lift cleanly off the grate. Add cheese in the final 2 minutes if making a cheeseburger; the ambient heat melts it draped over the patty without scorching. Cook another 5 minutes until the second face reaches a deep sear and internal temp reads 160 °F for beef or 165 °F for plant-based on a thermometer probed horizontally into the side. Plant-based variants (Beyond, Impossible) need 360 °F for the full cook — the plant-protein structure scorches grey-mealy at 380 °F before the centre warms through.

Oil & seasoning

None for beef — frozen beef patties carry 20–25 g of fat per ⅓-lb patty that renders during cooking and self-bastes both faces to a deep mahogany sear. Adding oil just pools smoking fat in the basket by minute 3. Plant-based patties (Beyond Burger, Impossible Burger) are the exception — their fat blend doesn't render the same way beef does, so a light oil mist on top before loading helps surface colour develop; without it plant patties cook noticeably paler than the box photo.

Watch out for

• !Do not thaw the patties before cooking. Frozen burgers cook better straight from the freezer than thawed because thawed patty surfaces release brine onto the basket within the first minute and the bottom face steam-cooks grey instead of developing a hard sear. If a few patties have partially thawed, refreeze them for 30 minutes before cooking.
• !Single layer with ½-inch gaps is essential. Overlapping patties block the airflow that gives both faces their hard sear; touching patties steam-cook their contact edges pale-grey and can fuse together into pale-edged stacks. A 4-qt basket fits 3 ⅓-lb patties single-layer; a 5-qt or larger fits 4 patties. Cook in 2 batches rather than crowding.
• !Internal temperature targets are non-negotiable USDA targets for ground meat: 160 °F (71 °C) for beef and Beyond Burger; 165 °F (74 °C) for Impossible Burger and any chicken or turkey patty. Ground product cannot be safely served pink the way a whole steak can because surface bacteria are mixed into the centre during grinding. Probe horizontally into the side of the patty at the 10-minute mark — not through the top, which over-reads the surface temp. Add 60 seconds if the reading is below target.
• !Plant-based variants (Beyond Burger, Impossible Burger) need 360 °F instead of 380 °F for the full cook. The pea-protein structure in Beyond and the soy-protein structure in Impossible both scorch into a grey-mealy texture above 370 °F before the centre warms through to a safe internal temperature. Drop the temperature 20 °F and add 1 minute (12 min total).