Frozen corn in a pressure cooker - Pour 1 cup of water into pot and put a vegetable steamer in the bottom. Open basket and lay cobs inside overlapping as little as possible.
Close lid and steam valve and set to high pressure for 3 minutes. Do a natural release for 1 minutes and then release rest of steam. Use tongs to remove cobs, spread on butter and salt and enjoy.
How to boil frozen corn on the cob - Fill a large pot with water, cover with a lid until it reaches a rolling boil. Set cobs in with tongs, remove lid and boil for 5-7 minutes or until kernels are fork tender.
How to microwave frozen corn on the cob - You would want a microwave safe dish where you could pour a bit of water into the bottom. Place pieces on top and cover tightly with plastic wrap. Heat for 8 or so minutes for ears - or until tender. Timing depends on how large the cobs are and how tender you want them.