What's the correct way to brew a single cup with the K-Duo Essentials?
Place a mug (12oz minimum) on the drip tray, insert a K-Cup pod into the pod holder, and lower the handle completely to close the lid. Press the OZ button, then select your brew size (8, 10, or 12 oz). The brew will complete in about 1 minute, and you can lift the handle and dispose of the used pod when finished. (Page 3)
From the official Keurig K Duo Essentials manual, page 3
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