Abstract: An adapter for a single-serve beverage machine configured for brewing coffee through a beverage unit, particularly an at least partially plastic unit with integral filter such as a K-cup®, is disclosed. The adapter includes a housing forming an aperture. The housing has upper and lower portions with a screen spanning across the aperture at a transition of the upper and lower portions such that the upper portion and the screen form a well. The housing includes an outer surface adapted to mate with the single-serve beverage machine such that the single-serve beverage machine may be utilized with a coffee-filled paper pod resting in the well instead of the at least partially plastic unit with integral filter. Also disclosed are kits, systems, and methods associated with the adapter, for example a method of adapting a machine from use one type of beverage unit to use with a coffee-filled paper pod.