If you prefer, you can set them on a microwaveable plate or tray. If you need to cook more than 4 ears of corn, cook them in batches. Microwave for 3 to 5 minutes: For just 1 or 2 ears of corn, microwave for 3 minutes. For 3 or 4 ears, microwave for 4 minutes. If you like softer corn or if your ears are particularly large, microwave for an additional minute. Allow to cool: Set the ears on a cooling rack or cutting board to cool.