Combine the onion, garlic, thyme, and bay leaves in an Instant Pot. Place the corned beef, fat-side up, on top of the onions; sprinkle with the seasoning packet. In a small bowl, combine the beer and ...

large yellow onion, peeled and cut into 1/4-inch slices large cloves garlic, chopped sprigs fresh thyme bay leaves (3- to 4-lb.) package corned beef brisket, with seasoning packet lager-style beer ...