Abstract: Ground coffee is packaged in a disposable brewing device for use in brewing a mug of coffee in a novel and unique manner facilitated by the use of a microwave oven. To prepare a freshly brewed mug of coffee the disposable device is inserted into and attached unto a coffee mug, water is added and the mug is placed in a microwave oven. A resilient stable element supports and anchors a filter bag containing premeasured amount of ground coffee beans. Expandable inner volume of filter bag facilitates percolation, minimizes buoyant force and prevents spill-over. Materials with varied coefficients of absorption to microwave energy are utilized in construction so that desired temperature differences are realized.